4L60E Pressure Regulator Valve (Boost Valve) (Part 2 of 3) (4L60E Line Pressure)

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Learn how the 4L60E Pressure Regulator Valve (aka PR Valve) works. In this video we take a closer look at the Boost Valve and Sleeve. We learn how the trans is able to elevate the line pressure.
Help this Channel Grow: • Help This RU-vid Chan...
**More 4L60E Videos**
Pump: • 4L60E Pump: How Does I...
PR Valve (Part 1): • 4L60E Pressure Regulat...
PR Valve (Part 2): • 4L60E Pressure Regulat...
PR Valve (Part 3): • 4L60E: PR Valve (Part ...
AFL Valve (Part 1): • 4L60E: AFL Valve (Part...
1-2 Shift Valve + Solenoid (Part 1): • 4L60E: 1-2 Shift Valve...
1-2 + 2-3 Shift Solenoid (Part 1): • 4L60E Shift Solenoid -...
Planetary Gearset: • Planetary Gearset - Ho...
Power Flow (OD Gears): • 4L60E Power Flow (1st,...
Power Flow: (Manual Gears): • 4L60E Power Flow - Man...
Teardown: • 4L60E Rebuild: Teardow...
Teardown Time-Lapse: • 4L60E Teardown (TimeLa...
Output Shaft Swap (2WD to 4WD Conversion): • 4L60E Output Shaft Swa...
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16 авг 2021

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Комментарии : 69

@SouthpawAutoworks 2 года назад

Thank you for being here! If it feels right to you, help me spread the word about this channel… 1 Handed Transmission Rebuilder (60 sec): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZQHtrVFUHdk.html

@rylandallas9907 Год назад

Thanks for your efforts!

@craigj.651 2 года назад

Great video series

@rylandallas9907 Год назад

These videos are amazing, have taken numerous notes, thank you

@SouthpawAutoworks Год назад

I'm really glad to hear that you're getting value from the videos. Appreciate you dropping me a line.

@russellstephan6844 Год назад

Kewl! I'm currently experiencing an occasional hard slam into reverse from park on a 1993 C1500 5.7l with 235k miles. This video was very helpful in understanding part of the reverse hydraulic circuit. First up on the attempts to fix is a new TPS (throttle position sensor). Obviously, the ECM gets some of its information about engine load from the TPS. If that glitches, it could be commanding harsher pressures for the shift to reverse. Thanks for taking the time, effort, and expenditures in hard cash resources (video and illustrative equipment) to produce these quality presentations. They are detailed and extremely informative!

@SouthpawAutoworks Год назад

Really appreciate your comment. Wishing you the best on 93 4L60E.

@ohane1 Год назад

Awesome videos! Wish I'd watched before building race 4L70E. Your videos help me understand my upgrades!

@SouthpawAutoworks Год назад

Right on! I love it! Thanks for dropping me a line.

@williamthompsen6915 11 месяцев назад

Best information videos on the internet

@SouthpawAutoworks 11 месяцев назад

Glad you think so!

@10malabdullah10 9 месяцев назад

Great videos

@SouthpawAutoworks 8 месяцев назад

Thank you, kindly. Appreciate all of your comments.

@CORVAIRWILD 2 года назад

I also have a 1990 4x4 suburban 1500. Original 700 R4, I just drove it back from Florida, 1500miles, towing a heavy load, and it shifts very nice and soft, typical GM. And when it's hot cold, when you put it in drive it clunks extremely harshly. It's not the ujoints, I just changed 1. I didn't put a new accumulator in the aux valve body, as per friend's recommendation, it still does the same thing. Hot or cold, and it's only occasional. If I put it into 3rd drive. Not overdrive, it doesn't do it. Only when you put it into overdrive, and this of course standing still, normal idle speed

@SouthpawAutoworks 2 года назад

Info received.

@JomsF 2 года назад

I just woke up lunch time, checked my phone and checking em out

@SouthpawAutoworks 2 года назад

Awesome! Thank you for your support. I appreciate you, Joms F.

@JomsF 2 года назад

@@SouthpawAutoworks you are welcome bro

@cockasorrus7475 2 года назад

Fantastic segment!! Thank you for all the work you put in.

@SouthpawAutoworks 2 года назад

You are welcome. I appreciate you watching it. Thanks for dropping me a line!

@cockasorrus7475 2 года назад

@@SouthpawAutoworks Hey brother I was on my phone commenting earlier. Now that I'm sitting at my NORAD control center I can properly tell you that I am AMAZED at how the trans. fluid travels into those TINY orifices!! Damn talk about creating press. with a downsize!! I have been working on a multitude of my collection and I will get to asking you about the '76 p/u w/the either 700R4 OR 4L60 I haven't gotten really acquainted with the truck yet. It's one of those and if I'm not mistaken they are pretty much the same except a nomenclature change around 92? Very educational as always but with a great attitude and not a Zzzzz sleepy long drawn out ordeal as well! Very good to spread it out!!

@SouthpawAutoworks 2 года назад

I had to Google NORAD. ha. That would be a cool place to visit! (News Headline: "AZ man and NV man arrested for trespassing...") Couldn't agree with you more! The hydraulics within the 4L60E, or any auto trans for that matter, is downright amazing. Later in this series, I will be covering how this circuit (Boost Valve + Torque Signal circuit) can cause premature failure of the 3-4 clutches...a huge problem with the 4L60E. Nomenclature: 700R4 vs 4L60. In my mind, it's six of this, half a dozen of that. I happened to call everything from 82-92 a 700R4. 93-Up is 4L60E. I happen to have a 700R4, on hand, for filming purposes. Just haven't made time to do anything with it. Good news is, the 700R4 and the 4L60E are very similar. If you know how to build one, then you can easily build the other. Thanks for your the feedback, James. Appreciate you.

@cockasorrus7475 2 года назад

@@SouthpawAutoworks you get a true understanding for do not use red shop rags or anything else that sheds! It wouldn’t take much to obstruct the orifices in the PRV & valving in the V/body. Yes lol on NORAD! Glad to have opened your mind to something you didn’t know!! I went to rebuild my 84 G20 van trans. 700R4 years ago. I started to read the preface-introduction in the book I got from Amazon. Well that’s all it took. I sold the trans. for $60 on Letgo. I took a TH350 w/a 9” tail (1/8” difference between the two) rebuilt it and the van is awesome! Sure I don’t have overdrive. I do have a trans. that I’ll never have to rebuild though. The first TH350 I rebuilt was in my 77 GMC 4x4 I drove it for 12 years with it. Sold the trans. to a guy who needed a 4x4 TH350 for his Toyota project. I had been waiting to put a Hughes Perf. TH400 I have in the 77. It is in there now and it’s awesome! The reliability factor outweighed the miser factor. I think the reason I had issues with failing 700”s was the TV cable. Running after market carbs with the wrong geometry for the connection to carb linkage. I did purchase a correction adapter for the 76 P/U. They didn’t have one on it! The fluid smells really good and clean. Crossing my fingers it’s okay. I think at most it has 800 mi. on the engine:trans. The van though was just a nightmare with the fact that I (according to the book) would have to UPGRADE the early 700 so much that it would be a fortune to rebuild. I have 9 registered vehicles and hardly go anywhere! If I put a couple hundred miles a year on one that’s a lot! lol Hey Bob sorry so much information and bouncing around. Hope you could follow it all.

@SouthpawAutoworks 2 года назад

Such a good point about the shop rags!!! I'll be sure and use that as a reference in a future video. Thanks for bringing that up! The littlest of things can make/break us. I love to read, and learn many new things by reading about it. However, it's a lot easier to learn something new by watching a video. You're absolutely spot on about the 700R4 TV cable. The geometry is key! And...it has to be set up correctly on the trans. It takes two people, working together, to calibrate it correctly. Another video for the future. Periodically, I will read through forums/groups, and hear people complaining about the trans that they bought from some supply house. "It only drove for x miles, before it failed." I instantly think about TV cables, and the like. Overlooking stuff like that can smoke a new trans on the road test. Nine (9) vehicles!!?? You've got yourself a convoy. ha. "Registered" vehicles?? Is this implying that you have more than 9????? ha Good talking with you, James!

@aaronmillican5947 2 года назад

Hi Robert , Great videos ,i have been rebuilding 4l60e since the late 90s. Learned a few things regarding the oil flow paths and how they work. I live in Australia and 4l60/ 4l60e is a very common trans Regard Aaron

@SouthpawAutoworks 2 года назад

Since the 90's? Right on!! It's crazy how many vehicles this trans is equipped in... Appreciate you you checking out the video. Thanks for dropping me a line! PS - If it feels right to you, please help me spread the word about this channel. 1 Handed Transmission Rebuilder: (60-Sec Preview) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-y3Vixa_Ec1E.html How the 4L60E valve-body works: (60-Second Preview) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fWPSaLeaOXI.html

@CORVAIRWILD 2 года назад

Sorry for the typos, I'm using talk to text. And I missed those

@SouthpawAutoworks 2 года назад

No worries.

@mrbreezeet1 10 месяцев назад

Thank You Very helpful! But I can't seem to find part 3 can you link to it please?

@chriskoliadko Год назад

love the videos, great explanation. got a question, I've rebuilt about 15 4l60e's, and just did my newest 2008 with a master overhaul kit from WIT, that had the typical failed input clutch and that was it, once back together, no reverse on the lift. tore it back down and to low reverse was burnt just on the lift. not an issue before, i did do the transgo 1.9 boost valve when the one in it was a 1.8 in it. transgo says it is compatible with both but it burnt low/reverse, first was weak and would not shit to 4th on the lift. thanks for any pointers.

@SouthpawAutoworks Год назад

That's hard to say. Haven't had any issues using that particular boost valve setup. What's the line pressure with the engine idling in Park? What about drive? Reverse?

@rusty95356 9 месяцев назад

Great Video Presentation. I have a 2005 4 wheel drive Silverado when I back up into the driveway or up hill the truck slips out of reverse this happens intermittently, but I can shift into 1st 2nd and 3rd and drive off with no problem runs great what do you think the problem might be?

@SouthpawAutoworks 8 месяцев назад

It sounds like you've got a clutch that's slipping in Reverse. Reverse is created by two clutches: 1). Reverse-Input Clutch. 2). Low-Reverse Clutch. If either clutch starts slipping, we lose Reverse (or Reverse starts slipping). There are ways to identify which clutch is slipping, while conducting a road test. A future video topic. Fluid level: If the fluid level isn't set correctly, this could also cause problem backing up a hill. The filter pickup is located near the rear of the transmission oil pan. When backing up hill, the oil is flowing towards the front of the trans...away from the pickup. Always a good practice to start with the basics...

@CORVAIRWILD 2 года назад

I had a late 80s, aux valve body, 700R4 rebuilt for my 1984 6.2 diesel 4x4 suburban. The shop is very reputable, I know that it's a good job, I'm friendly with the owner. It shifts rock hard, which I'm fine with, because I use it for heavy towing. The only problem I have is problem but it sits for a day or 2, it takes forever to go into the driver or reverse. What is causing the fluid prime to bleed off?

@SouthpawAutoworks 2 года назад

It sounds like a drain-back issue. The pump is responsible for multiple tasks. One of those tasks is filling up the torque converter with fluid. If the converter is low on fluid, it will not allow engine torque to reach the input shaft of the trans. If the vehicle is parked for days, it's possible for the torque converter to partially drain back into the pan. This, of course, is not normal. When the converter is partially drained, the pump needs time to fill it back up, before the vehicle will move again. A worn pump bushing can cause this issue. If the bushing is indeed the issue, I'd also be looking at the dowel pins on the engine, and the corresponding pilot holes on the trans bell housing. If these are worn, it can allow for a misalignment, putting extra stress on the pump bushing....causing premature wear.

@Hitman-ds1ei 2 года назад

A tip I picked up years ago was to bolt housing to engine and have a dial indicator in flywheel or crank or flex plate whatever and check run out with the trans or bellhousing on the block you were using together, surprising how many times there is a stack up mismatch of production tolerances that cause bearing failures

@SouthpawAutoworks 2 года назад

Right on! Thanks for sharing!

@frankensteinrules6511 2 года назад

GREAT VIDEOS!! I Subscribed. I have a 1993 k1500, have to let off gas to go into 2nd. So I rebuilt the 1-2 accumulator, servo, and while i had the pan off changing fluid and filter rebuilt the valve body with a transgo sk-4l60e kit. It's just an upgrade kit, not a high performance, I got it all back together, let it warm up and went thru gears. Had reverse for a few seconds then no reverse, so I dropped the pan to check boost valve. The c-clip came out of its groove, put it back in and everything back together. Tried reverse again, nothing, not even for a few seconds this time. In the morning, going to check c-clip again and get a new boost valve with new c-clip. Before i got into tranny, had good reverse, just the hick-up with it going into second, all other gears are fine. Any feedback greatly appreciated, Terry.

@SouthpawAutoworks 2 года назад

Hi Terry, it's exciting that you are fixing your 4L60E on your own. Occasional setbacks are a normal part of transmission repair. I've had plenty of my own. Mistakes can be great teachers... I am familiar with that upgrade kit. When time permits, I'm going to review the kit instructions, look over the hydraulic schematic of the 4L60E, and get back to you. For the mean time, here are my initial thoughts... Per the video, there are two clutches used to create Reverse; The Low/Reverse clutch and the Input-Reverse Clutch. The Boost Valve/Sleeve is part of the hydraulic circuit that feeds the Input-Reverse Clutch. When the Boost Valve/Sleeve fell out of it's bore, it created a huge leak in the Input-Reverse Clutch circuit. A leak this large makes it impossible for the Input-Reverse Clutch to be activated. Just to be clear, in order for Reverse to occur, two clutches must be activated, at the same time. If only one clutches comes on, then the transmission acts as though it has been placed in Neutral. If you're interested in gaining a better understanding of how the 4L60E gears are achieved, check out these videos: Planetary Gearsets: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QjT0CUG73YM.html 4L60E (Manual Gears): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6kfAuXJFYFE.html 4L60E (OD Gears): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-IfOqbTqKubE.html 4L60E (Reverse): Naturally, I have not created this one...yet. Coming soon! Terry, Did you happen to also replace, or upgrade, the Boost Valve & Sleeve?? Reason I ask: There are two (2) different lengths of sleeve. Can you measure your Boost Sleeve with a dial caliper? Note: Take the measurement at the portion of the sleeve that touches the snap ring (c-clip), and the portion that touches the large outer spring. Do not measure the "nipple" at the end of the sleeve. Note: If you need a refresher on how to use a Dial Caliper: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yBKXO9l42lQ.html I look forward to your response, Terry.

@frankensteinrules6511 2 года назад

Thanks for the reply.I figured out today what was going on. Put a sonnax boost valve pressure kit in, and now i have all gears. Still think the band is going south, but hope to get several thousand more miles out of it by putting in a sonnax servo pin, which is longer than the longest GM pln. Will be doing a complete rebuild this winter. The toughest part will be pulling the tranny at 70 years old. Looking forward to more of your videos, Thanks.

@SouthpawAutoworks 2 года назад

I appreciate your response, Terry. Good deal on the boost valve. You can also increase the length of the pin (in essence) by using the large gold shim/washer that comes with that TransGo kit. I imagine that you've already tried that....but I thought I'd throw it out there, in case it was overlooked. For what it's worth, there may be a command issue causing the 2nd gear issue (or a sticky valve in the VB). You previously mentioned that you have to let off the gas in order for the 1-2 upshift to occur. I've got some ideas, but that's gonna have to be another conversation (or video), for another time... I've got a lot more 4L60E videos in the works; what parts fail, recommended upgrades for different types of builds, more how-stuff-works (gaining this knowledge makes parts selection easier), transmission diagnosis, etc. If you haven't done so already, subscribe and hit the notification bell...so you don't miss any future videos. Have a great weekend, Terry!

@juansorto6162 Год назад

You fix it mine does the same I put the 1-2 and 3-4 accumulators acts better but still not 100% I bought the truck with 130k from original owner he just had the trans rebuilt trying this hood valve next

@Roscotech Месяц назад

I purchased several “O” ringed (outer portion) boost sleeve/boost valve assemblies that were made by the Sonnax company. Stick dementions are 0.471 (reverse boost) and 0.421 (load boost). The Sonnax valve is 0.531 and 0.491 respectively compared. This seems like a lot to me (the amount of increase)! I have yet to experience the effects that the larger valve may have. Any idea what I should expect? The first one is installed in a pump with a new oversized pressure regulator valve needed to restore sealing integrity to the pump.

@tesfahungetahunargachew4328 Год назад

Nice explanation bro but try to some animation to explain some complicated systemes and opration

@SouthpawAutoworks Год назад

Couldn't agree more. At some point, after this video, I did spend the time to create a number of animated videos...for a better viewing/learning experience. Hope you enjoy them. 4L60E: PR Valve (Part 3) Torque Signal Oil Pressure (4L60E Line Pressure): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-PY1trZeLqTM.html 4L60E: AFL Valve (Part 1) How it Works: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LqBkdegPjNk.html 4L60E Shift Solenoid - Part 1 (Basic Operation): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FaChWmcsAgI.html 4L60E: 1-2 Shift Valve + 1-2 Shift Solenoid (Part 1) Basic Operation: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jPhm76RDz6Y.html

@KillerRage360 10 месяцев назад

Recently tore down my first 4L60e that has a reverse not engaging, everything looks perfect from clutches to low reverse piston lip seals. When putting the car into reverse you can feel it trying to barely engage but nothing after that even with throttle applied no movement. Im hoping i find something within the boost valve area that could be the issue.

@SouthpawAutoworks 8 месяцев назад

Did you find the problem?

@Shalash87 2 года назад

It is also worth noting, that the isolator spring and boost valve also act as an accumulator for the Reverse Input Clutch.

@SouthpawAutoworks 2 года назад

That's very interesting. I never looked at it that way... You've got my curiosity peaked. The Input-Reverse circuit has a check-ball/orifice (in the separator plate), but no dedicated accumulator (Low-Reverse circuits are somewhat similar in setup). I previously rationalized that GM got away with not having an accumulator in this circuit, by employing the Belleville spring (dished steel plate, cushion plate...whatever you want to call it) in the Input-Reverse clutch pack. You definitely got my mind running...and I thank you for that. Thanks for dropping me a line!

@mrkmssr33 2 года назад

@@SouthpawAutoworks could this explain the condition of no reverse but then suddenly engaging at high rpm’s? If the boost valve is malfunctioning?

@SouthpawAutoworks 2 года назад

It sounds like there's a leak in the Reverse circuit. By raising the RPMs, the pump will increase oil pressure, and deliver more oil, to the circuit. This extra pressure, and extra volume, can help overcome a hydraulic leak. However, if it's slipping that bad, then it's typically time to open up the trans. There are two (2) clutches that are responsible for creating Reverse. You can conduct a road test, and identify which clutch is causing the problem, before you tear into the trans, take it into a repair shop, etc. I'm happy to share more info...as time permits. Let me know if you want to learn more.

@mrkmssr33 2 года назад

@@SouthpawAutoworks wow! That’s some good info. I was going to put a Sonnax higher PSI boost valve in, but it sounds like that at best would be a temporary fix. The high reverse gear is working fine, it’s the low reverse gear that seems to be not engaging. I’m excited to try to rebuild it myself, should I just try to do the reverse clutches or just for a full rebuild?

@SouthpawAutoworks 2 года назад

Yeah, if it's slipping that bad, I'm thinking that the damage is already done. Slipping clutches create a lot of heat. Chances are the clutches are smoked. Plus, the oil is probably cooked, too. If you pull the dipstick, you can examine the color of the oil, and the smell of it. White paper towel can help with identifying the color. While it is possible to replace bad clutches, and do nothing else, it's not typically the best course of action. Generally speaking, clutches don't fail all on their own. In other words, there's a reason why they failed. Always best to try to locate the "root cause" of the clutch failure. If this is overlooked, you can wind up smoking the same clutch, all over again.

@stevensmith3291 Месяц назад

Hp tuners talks about garage pressure. And has a channel to log. What exactly is garage pressure

@jimhenderson2308 11 месяцев назад

Doesn't the inner spring also contribute to the minimum pressure at 55 psi?

@johnnyroberts9597 Год назад

4l65 e parts guy sent me an early boost valve an sleeve that is longer than than the later 06 an up. Can I still use the longer one

@SouthpawAutoworks Год назад

There's an aftermarket company that uses a one-size fits both (long & short)(I believe that they advertise it this way, too). However, I believe in all other instances, you'll need to have the correct length to match your application.

@cristianzainaghi9822 Год назад

Hi Robert, Oggetto: "1999 Corvette C5 transmission issues". Hello, this is Christian from Italy. I hope I'm not bothering you, but I'm really struggling to solve my Corvette issue. Maybe you can help me. I'll try to be concise: the issue is related to the 4L60-E transmission on my Corvette (1999 C5 LS1 345hp). It has been rebuilt three times. The first two times it has lasted 6000 mi, while the third time only 5000 mi. At this point I decided to change mechanic in order to perform a better diagnosis. The new mechanic found out that new stronger springs, a new clutch kit, new gaskets, ect., would have solved the problem. Additionally he also raised the pressure parameters on the ECU (he assessed they were too low), reinstalling the original values. When the car finally came ready, I went to pick it up to drive it back home on a 300 mi trip. That day temperatures were above 100 degrees. Bottom line, after 150 mi, trying to pass someone on the highway, the transmission failed again!!! I'm a kind of desperate. Do you have any idea about which component could be responsible of all this? The issue looks like being related to the Driver and the third gear. First and second gear are fine. I accept any suggestion. Thank you for your time. Best regards, C. Z.

@SouthpawAutoworks Год назад

Have you tried cleaning the MAF sensor? I know it sounds crazy...but it is a major load sensing device, that the PCM uses to increase line pressure in the trans. Therefore, if it the PCM doesn't know about the additional engine load (via the MAF sensor), then the line pressure will not be increased.....resulting in excessive clutch slippage....resulting in clutch failure. FYI: Andy cleans MAF on a daily basis, at the shop he works at. Just a normal part of transmission repair.

@cristianzainaghi9822 Год назад

@@SouthpawAutoworks I try to do this check because at 77 miles after the last overhaul, it kept shifting gears and had never done this before. I don't know if this is a sign! A thousand thanks.