75 Degree DROP By Removing This Valve On My 10L80 Trans 

190 is way too hot for a transmission temperature I have seen thousands of transmission failures due to these kinds of high temperatures I’ve never seen a single transmission failure due to running them cold All of GM’s newer three-quarter ton trucks and up run at 143 to 155° transmission temperature using the same exact ULV transmission fluid as what’s used in the half ton 3.0L Duramax trucks

That’s good stuff ! I’m assuming this was on a LM2?

That’s spicy!

I didn't know they came out with one for the 3.0? All I have seen was for the gas engine style, on the transmission.

@@DemonWorks Says it’s for 6-8-10L?

@@ryanlogan2911 It does, but it's made for the lines with the manifold on the side of the transmission, which only the gas engines have. The 3.0 is the only one with the valve on the side of the engine.

@@DemonWorks maby we need to hit Improved Racing up to build us a Thermostat bypass which opens at a lower than stock temp.

@@ryanlogan2911 I did :)

According to some guys' anecdote in a GM forum, it isn't an issue in the winter because the truck will close down the the grill shutters to get the trans temp to a reasonable operating temperature. I ordered one of these and will be see how it goes next week while we still have temps in the 30's where I'm at. Thought about just doing the larger trans cooler but that alone doesn't seem adequate and both seem overkill.

@@derekpearson766 how was it during the winter months

@@droppeds10404 Unfortunately, it didn't fit on my '24 due to a plumbing change that I wasn't aware of.

I prefer the LZ0 but the LM2 is superb as well. i had a 20/21 and 22.5 and they all did the job well ! You really cannot go wrong with any, just choose the color and interior you like and you will be fine.

I saw that kit, I believe it's designed for the built in bypass at the line manifold on the side of the trans (not our design) but unsure if it will also fit our block.

@@DemonWorks Looks like it would fit the block, but not work. I emailed support at Superior Transmission and they replied instantly. They said that kit wouldn't work because the blow off spring is too heavy (they claim there is only 25 psi being sent to the cooler) so they need to make some modifications so that it works properly. They did say they were working on making it compatible but wasn't able to give an ETA.

@@valmasj hey that’s great info! I appreciate you sharing that with myself and everyone else that reads this. I also appreciate companies that respond quickly as well as listen to the customers questions then work to resolving the issue. Thanks for sharing !!!

I planned on removing mine when it got colder out. Going to continue driving to see how long it takes to get up to temp then decide next step. Your temps sound great!

@@DemonWorks I think the cooler and the bypass is a little to much if your in a hot cold climate. If you live in a area that is always hot. Maybe both will work.

@@b18civicsi00 i absolutely agree. I was holding back for a future video, but I will just come out and say right now… I think, for my use, the deep pan and trans cooler with factory bypass valve is the way I will go.

No code for PPE products, unfortunately, but there is a sale from time to time.

I personally think your winter temps are too low to have this, but others may disagree.

Lm2 maybe ok, but the LZ0 probably not. Not unless you change the lines to the LM2 style.

Yes, it appears you would fit the temps perfectly.

any modification could alter warranty status. The high temps are for fuel economy, not longevity unfortunately.

@@DemonWorks longevity is better then the other option

Hey! The trans cooler took my temps down from 210 daily driving to 199 no matter what I am doing, daily driving or towing. Next I’m installing the ppe deep pan and going back to stick with this valve.

one could say so, but that goes for anything, even an aftermarket paper air filter.

I agree, That's why I waited until ambient temps warmed up before installing. My 5 minute test drive also doesn't show real numbers, my daily driving temps over the. next few days will be monitored...

It actually doesn't eliminate anything in the cooler like what you are saying. It's still going through that cooler, it's just not circulating through it and looping at the bypass valve. The system would loop the fluid through multiple it's at 196 then allow some flow through the cooler. this just eliminated the multiple loops.

I’m looking at installing a lighter spring for the factory valve and see how that works. I want the fluid to heat up fast but keep the temperature around 150°

Well the lighter spring in factory valve didn’t do much different maybe 5° less. Now it’s running around 190° that sucks and running the PPE block sucks too running at 120° and it takes forever to get there. The LM2 setup was perfect for this PPE block I guess GM found a way to fuck it up with this LZ0. If it had a different pill like a 140-150° in the factory valve it might work.

Works great in stock setups as well

In my opinion, this is too low. I will be doing a few new videos in the near future.

it does not, different design and you guys have a better temperature anyway.

I was curious about that as well

I haven't been able to find anything definitive on this specific transmission. The ford version calls for high temps, but even though this platform was built with Ford, I don't trust their side since their cars overheat the trans regularly on the track. I have always been under the teachings of the trans temp is typically 160-175. GM calls for 158 degrees when checking the fluid level So I feel that is the area of "good" up to 190 degrees. My prior LM2 trucks ran at 160-170 degrees. Stock 10 speed gas trucks have been shown to run in the 150-160's. So I would say operating above 150 is the minimum. Yes, it can be "too cold" and that is where I waited to install this until ambient temps picked up. i will monitor my temps over the coming weeks.

@@DemonWorks love learning about this stuff, keep up the good work!

For it to live a long, happy any healthy life, about 165-170*.

@@sierracat that’s where my prior trucks were, I like 160-190. 190 being hottest it reaches when towing. Normal driving, 160-170.

Was that with a PPE trans cooler? My '21 LM2 typically runs 185-190*.

always check the trans fluid level and do it at proper temp.

Also my truck is setup for Overlanding so it’s kinda heavy

Yes, I saw a significant drop in the limited testing I did. Will do more testing over the next few weeks.

@@DemonWorks I have the LZO in mine towing in fl. my trans temp is 205

in 30 degree ambient temps i was hitting 210 degrees just driving. I have talked with a bunch of people and temps all vary but it seems the LZ0 on average, runs hotter trans temps. All of my LM2's were much lower

Yes I see temps around 165° driving in Houston,TX

Works great on the LM2 as well, temps of 140-160 have been reported here by others.

Nevermind was not looking at the pics correct

it will not, different design on the gas trucks.

Depends on where you are and what you are using the truck for. I’d say if you are in a warm climate, the bypass valve is the way to go. If you are somewhere that gets really cold, I don’t t think the valve is a great idea. I’m in that category so I’m running the trans cooler with the deep pan. Will be toying with the stock valve real soon though.

So going by your diagram of the transmission fluid layout, won't the cooler that receives engine coolant help with maintaining an idea temp for trans fluid if the bypass, deep pan, and PPE cooler are used under higher load conditions?@@DemonWorks

@@huntsman12g that cooler receives coolant flow from the coolant valve, helps to get the trans temp up quickly. I do not know the temp in which that valve opens or closes though.

I am installing the deep pan today. My prior pan video was for a different truck I had. I will be pulling the Poe valve off and back to stock, then gave the ppe pan and cooler. Will note the temps

@@DemonWorks considering changing it out on my 22’. Did you notice a substantial temperature change on the prior truck?

@@Jim.Christy prior temps were 160-175 on the prior trucks. That’s why my LZ0 temps are so interesting. I’m hoping to get those numbers again, while doing this video, I saw the valve is open by 170. In theory, we should be able to maintain that 170-175 but since we are not, I’m thinking it’s a low flow situation. The additional fluid in the pan can help with temperature management. I have documented every change and temperature with this truck so I’m hoping to have all of the data needed to help everyone decide what they need/want.

It's out of stock, will return to the site when in stock.

Different setup, but this is what I use (5.3/6.2 Trans Temp) as fact when people tell me the transmission isn't meant to be cool. thanks for sharing !

I have a 2020 at4 6.2 And noticed your comment so you got the ppe bypass valve for the 3.0? And worked on your 6.2?? Plz let me know because I want to get it just wasn’t sure if it would work although they have the same transmission

Yes, I did have the other parts prior but the bypass valve is the big one for the cooler temps.

@@DemonWorksCorrect me if I'm wrong but it seems like the deep pan and cooler drop temps 25-35 degrees where as the bypass drops them around 40-50 degrees. To me, it makes the most sense to just run the bypass since it gets operating temps around 160 degrees and because it's cheap and easy to install. Have you ever ran the bypass exclusively?

it will not, unfortunately.

Not yet, need to be able to get it up in temp (longer driving). The amount lost was minimal, so I’m not concerned right now. It will get topped off in the near future and I do use a pump device for that.

@@DemonWorks can you make an update video about the highest temperatures you're running in daily driving? My LM2 gets up to about 190. Driving in the city. Stop and go traffic. I'm looking for something to lower those temperatures down to about 150 or so

Based on the testing in the video, the stock unit was wide open at 170 degrees. So, this open valve may be too open for me, I now know the stock valve will be open by 170 and that’s fine but why am I still getting as high as I am is the next question. I’m going to put in the deep pan next with the stock valve and see what that does for me. Stay tuned!

@@DemonWorks nice, I suspect the stock valve just doesnt flow much through the thermostat, so even if fully open it's only getting a relatively small portion of the fluid out to the radiator. Looking forward to all the testing. This will be super helpful for those with either generation engine.

@@ALMX5DP I agree. Maybe there’s a way to modify the factory one as well, unsure. I have fun testing this stuff out.

This gives me vibes back to the old days of running no thermostat on our cars when they ran too hot. Not sure if this is the best idea because there’s always a sweet spot of where the temp should be at. Too cold isn’t a good thing

What’s too cold?