6T40 Common problems 

Have you ever figured out the problem with the transmission flare from 2-3 and 3-4. I have the same issue and it only does it after the tranny is warmed up. No codes either. If it has to do with the pressure switches I would probably do that my self I know this is one of the common issues and the reason gen 2 doesn't have them. Lol I want to do the wave plate too but can't bring myself to do that much work now.

I have not use one yet

I do not have one yet

@@GaryFerraro ok, thanks for the great videos

Could be a 1-2-3-4 clutch piston problem being the fact that reverse works, if this did move forward a little, the computer assembly will not do the trick, sounds like a piston problem

Is this a used transmission your getting?

@Gary Ferraro yes it is, out of a junk yard.

@@benjaminwilliams2359 I think it will fit but you should confirm this through the vin numbers

I think ford made the plate much better, haven't really seen that either on fords

It’s a joint venture trans with GM and ford. The trans are very similar. The GM’s use the tcm in the valvebody and ford uses the pcm to control the trans

You are correct, my buddy had it done the first time under there warranty, then i did the trans last year

What recall? I don't believe they ever issued an actual recall, just the extension to warranty

are you having any issues now with the trans?

@@GaryFerraro No. I did 3 drain and refills last June using AC Delco Dexron- VI full synthetic. I drove about 200 miles between drain and refills. I was surprised to see what must have been the ATF from the factory was black. The car shifts fine.

The shaft is held on place by a small snap ring, get the snap ring out and the shaft will pull right out

I have not done any of those yet

Where are you located? do you have the tools to change it? is the trans still in the car?

is your foot steady on the gas or are you pressing down to go faster

@@GaryFerraro Hi, it will not go into 6th gear again either when my foot is steady on the gas or when I'm pressing down to go faster. If you stop the vehicle and switch it off and switch it back on it will shift through to 6th gear but will shift back to 5th and the same pattern will happen.

do you have a scan tool to see if its being commanded to do this@@bennievanzyl9709

Any codes? how is reverse engagement?

@@GaryFerraro No codes, reverse engagement is fine. Just the rough shift when cold and then vibrations when hot (2nd to 3rd, around 25 MPH)

@@djamalbensebaa469 did you ever find out the problem and fix

Welcome

@@GaryFerraro any info about repair price? I guess 1000 £/$

@@kristofszabo1357 Here in the states, i get around 3000 u.s dollars

@@GaryFerraro thank you

You may have Slight movement, if not leaking should be ok. When the mounts where checked was someone sitting in the car power breaking it?

Sorry for not replying sooner. I had my wife shift it from reverse to drive and I noticed a bit of movement with the transmission along with the clunk I keep hearing. My local mechanic mentioned it could be the mounts or the chain inside the transmission.

@@user-yz2ur9or9f Not the chain, if you power brake the car in drive is there a lot of engine movement ? that will tell you if the mounts are good

The filter is getting clogged up, when the filter clogs, you will loose drive

@@GaryFerraro I cut one of the filters open and it didn't look excessively bad but maybe it was! Picked oil up instantly while cold... 🤔 Cheers for the reply, I'll get one of em back together and give it a try. Was just a bit concerned the fault may have been in the tecem. Thanks 👍

The pump MUST BE replaced when you rebuild it! Trust me-put a BRAND NEW pump into it and your problem will go away. The pumps in these units tend to warp, and when they do, everything will look normal inside the pump.. You won't see any significant wear, or damage, where the pump gears ride, or on the gears themselves, but the pump will make very little, to NO pressure. Also.... If you read through the ATSG manual it specifically states that the DOTS on the inner and outter pump gears MUST BE TIMED WITH EACH OTHER! Sounds crazy, but you if you are attempting to re-run a USED GM pump, you MUST TIME/ALIGN the dots in the correct orientation as displayed in the ATSG manual. My shop offers a 5 year/100,000 mile warranty on all of our 6T45E rebuilds and we NEVER waste time with a used pump... We ALWAYS install a brand new AC Delco pump in ALL of them.. I have tried in the past to re-use GM pumps and have experienced low line pressure, loss of movement, just as you describe... Avoid the drama-replace the pump with a new one every time and I promise you this will never happen again. While you are at it-replace the 3-5-R drum, and also the ring tower, new TEHCM, all bonded pistons, all frictions, all steels, and a bushing kit, and the Trans Go shift kit-even with the new pump, and also the Sonnax wave plate update kit... THEN you will find great success in building these units. Trying to re-run used TRASH is only a recipe for disaster. You *might* get lucky and it *might* work with used parts.. or not... but if it does work-for how long? Do you want a warranty job coming back in? it makes your shop look TERRIBLE. Better to invest the $$$$ up front, and do it right, and not worry about them coming back. I spend about $1800 in parts on each 6T45E rebuild... That's WHOLESALE pricing from Transtar, or WIT... You gotta put the $$ in these units if you want them to work, and not come back under warranty. We all HATE come backs-and this unit is really bad about that if you don't put everything in them that they MUST have. This is not a high profit unit.. It is a HIGH COST unit when you want it to leave on your FIRST attempt-you have to do it right. Cutting corners with this unit is going to bring you nothing but frustration, LOST time, LOST money... Think about having to pull it again when your parking lot is FULL of new work that all pays in excess of $4000 per job... was it worth it to try and re-use a used part? HECK NO! Put the $$$ in them, GET RID OF THE JOB and move on to other new work. These units are the LEAST desirable work we get in because of the high cost of repair-for both us, and the customer, and the added time they take to work on. I can turn 4 6L80e jobs in a single day, or ONE 6T45.... You do the math.. it's a LOSING proposition working on them. I only do them because my "mom and pop" shops take them in and I don't want to send them to another shop. Given the choice we would NEVER work on one of these units... SIMPLE to build when you follow the recipe for success. but still far too much investment of resources when there are higher profit margins to be had with simpler/faster units.

Transmission has been fine, learned the delayed reverse is just due to the wear and mileage, some lady tboned me and it may be worth more than I paid for it

Its 2 No recalls that I know of

did you scan it to see if any codes are present

@@GaryFerraro no codes at all which is very weird I did test drive it again today and it was shifting slowly, especially upshifts 3-4 After idling for about 15 minutes it couldn’t move at all, no reverse and drive. Even managed to change gears manually but the car didn’t move at all and I could rev it in gear. After 20 min and restarting the car, it moved again. Could be the torque converter or bushings? That’s all I can think of since the valve body is new and solenoids are new, and of course the clutches. Also I changed the seals except the small ones which are more like plastic at the very bottom

@@egilsb4187 Sounds like the filter is clogging up

@@GaryFerraro ok I will check it out, it was also new

I should mention I can actually hit 3rd. It just slips as soon as I do. I actually made it to 4th earlier today.

Rarely the solenoid for this problem, haven't seen that yet

@@GaryFerraro Would you suggest trying it first just to see? Replacing the whole TCM?

LOL, Thanks for watching, stay safe

I use one’s literally 500 bucks. You’re lucky it’s not a full-size SUV. You’re looking at like two grand.

What actually happens, when it should shift to 5th? does it seem like it goes to neutral? any codes? does it have 5th when cold?

@@GaryFerraro Hello, it seems that the transmission go to neutral (when flooring the gas the revs go up but the car does not accelerate)no error codes observed!Thanks for your help.

@@andrewgonchar3110 3-4 shift no problem? I've seen issues with the 4-5-6 clutch drum. If 3-4 shift is ok maybe be a valvebody or solenoid issue. Your sure it's 5th?

@@GaryFerraro 100%.to day will take it to the garage let's see what they can find out

@@andrewgonchar3110 ok, let me know what they say

I don't think the filter fell out, sounds like low on fluid

I would say it's a design issue

What is the problem, no 3rd, 5th or reverse

@@GaryFerraro gearbox jerked when shifting

Theres Generation one and generation 2, they cannot interchange, mGen 2 started around 2013 but heard reports of seeing them in 2012 also

@@GaryFerraro thank you for your reply, I think I'm going to go tomorrow as there's a 2011 that was sideswiped so the trans should be fine

Where are you located?

@@GaryFerraro DALLAS texas

I could probably hook you up with my rep here in NY

Your trans should have the updated parts already. The only thing you can do is a drain and fill , no pan to drop and you can't change the filter

Gary Ferraro thanks for replying Gary. I’ll do that.

@@avinanrey Ok, thanks for watching

Yes, i do alot of wholesale, sometimes i wish i got more

Fluid changes will not help, just happens by driving the car

@@GaryFerraro Thanks for the reply. =) Have you seen any 6T30s develop failures, or more 6T40s (If there is a difference)?

@@pcmacp719c1 From the 6t30 to the 6t70, they all have this issue, haven't had many 6t30, i see this on 6t40, basically same unit to difference may be the torque rating

@@GaryFerraro I guess all I can do is drive conservatively and hope for the best. Thanks again, hope you have a great weekend. =)

Cycle Michael hey man I got a 2012 sonic with 6T30 I just dropped it off to the shop for a rebuild yesterday at 80k miles. Good luck lol

Sorry I forgot to say thank u and God bless u

@@EdgarVasquez-hm5wq so this is on pull away correct, are there any codes present for the transmission? how is reverse?

@@GaryFerraro yes its on pull away and there is no codes present also reverse is good no problems there

would you say it slips on the 1-2 shift? or before 2nd gear

@@GaryFerraro before second. It ACTS LIKE 1st is gone and only works when 1st AND low/rev clutch is engaged. Would it be an accurate statement that Low/Rev stays engaged while in M1 but disengages at about 3mph when in D1?

@@dhonnoll78 Are there any codes present by chance?

@@GaryFerraro no codes. A code developed after changing the valve body BUT that code was 0700 I think. I left a cable not plugged in on the ECM and tried to start it. Other than that no codes.

@@dhonnoll78 Well, I'm Thinking a torn seal for the 1-2-3-4 clutch. To verify this, you would have to pull the valvebody off and air check the clutch pack

There is no pan or filter that can be changed in a normal service. It is a metalurgical issue with the wave plates.

@@tssci6774 Clutch plates not wave plates. They all have pans some filters are cleanable. 4 most common transmission problems. 1. Leaking externally from transmission cooler lines or radiator. No fluid no go. 2. Sludge in the valve body because of old fluid contaminated by water from condensation. Clogging passages. 3. Internal leaking caused loose bolts on the valve body. Causing lo pressure at the servo which compress the clutch plates in the clutch packs or apply a band. (works like a drum brake) 4. Bad electrical connections.

@@suggesttwo There is no pan on this transmission. The filter is not accessible for a normal service, and the term is wave plate or wave steel that fails as the author and ATRA describes it.

I have to research, the signal may con from the ABS, do you have any abs wheel speed sensor codes?

@@GaryFerraro ... No. Just the P0501 along with the P0700. I also had the transmissiin control module scanned and no codes were detected. The only thing I see on the dashboard is the speedometer going "haywire"! And irregular gear shifting. My car's transmission is the same one as that one on the chevy cruz.

@@TheKhwailed let me see what i can find out, what is the engine size?

1.6 leters ... 4 cylinders .. 16 valves ... I saw another video of you tearing down a 6T40 transmission. That's it!

Daewoo Lacetti 2009 1.6 DOHC

Do you hear the sound in all ranges, Park, reverse neutral and drive?

@@GaryFerraro just in drive and it's not always there but it is in most cases

@@abdulateefabdulateef8225 Does the noise change with engine speed? does the noise go away when shifts to 2nd?

@@GaryFerraro the noise go when it shifts to 2nd gear but the sound is not related with the engine speed so when taking off the engine speed is around 2000 rpm.

@@abdulateefabdulateef8225 May not be transmission related, the planetary gears are spinning up then may stop spinning in 2nd but the noise should change pitch as the engine rpm's get high, so the noise does not change?

does it feel like it's slipping on takeoff

@@GaryFerraro Thanks for the response! It actually does not feel like its slipping, but it just does not pull under 1k rpm at all... it almost feels like a high stall converter. I used an actual Dexron-VI fluid instead of a MV fluid... so I thought this would be okay. I noticed this morning while stone cold, it creeps as it should in drive, but after a 10 minute drive it goes right back to how its been behaving. Perhaps I should try ACDelco fluid anyways and see what happens

@@turbofiero86 Fluid you used is ok, Any codes?

@@GaryFerraro just a U0422 (Invalid data received from Body Control Module) which I assume to be unrelated

@@turbofiero86 Is the trans in limp mode with that code?

As of about one month ago, i purchased a new computer so all will be good now, thanks for watching

No 3rd,5th or reverse is very common

Im doing well, thanks for masking

is the code by chance U0101? Does the car shift or stay in one gear?

@@GaryFerraro change a transmission for another of a 2012 cruze car, nothing when I start gave forward and reverse, now it is not neutralized!

Sorry Gary it's neutralized!

@@isacolivas926 ok, so you put a used trans in or rebuilt the original one

@@GaryFerraro hi Gary, I put a repaired transmission, the original repair later to have in existence!