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Pros and Cons of Installing Later Transmission Thermostat with Lower Opening Temperature

Another JR

By Another JR
in 6.6L Gas V8 (L8T)

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Another JR Senior Enthusiast

Another JR

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Posted (edited)
2 hours ago, mrjulian416 said:

You tell them you are having a hard 2-1 downshift.   And then you give them the TSB mentioned in this thread which says even without reproducing the problem,  they should replace the transmission thermostat. 

That’s exactly what I tried, including giving them the TSB number to look up. They said they couldn’t reproduce it and couldn’t do it as a warranty item. I appealed to the GM technical ombudsman or whatever they are called, and after discussing it with the dealer they supported the dealer and refused. I told the dealer I’d just do it myself. 

 

 

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newdude
newdude

No cons, especially on an HD.  You will see a reduction in temps empty driving all day long.  Can it still build heat when towing?  Yes, but the fluid is flowing through the full cooling loop at a low

Grumpy Bear
Grumpy Bear

That is a flat out lie. Bolted the side of the transmission. Lord man, do it yourself. 

Another JR
Another JR

Yeah, that’s probably what I’ll do. I’m a bit concerned I’d have to add fluid, and the procedure for that may involve running the truck while adding fluid. (my BMW requires that). I’ll have to researc

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Grumpy Bear Senior Enthusiast

Grumpy Bear

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10 hours ago, Another JR said:

I told the dealer I’d just do it myself. 

 

Good for you! Be your own advocate. They don't have to live with the consequences. 

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  • 2 months later...
GMC4Zee Enthusiast

GMC4Zee

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Posted

I may have to try another dealer. My last towing outing the temps got to 225 degrees. Yes it cooled down once I hit the downhill but that is crazy hot. This is in PA mountains towing a 12K 5th wheel. I will try the other dealer in the area and if not then i will do it myself. It is just an externa module that bolts on, correct? Other problem is if you lose any fluid, do we not have a dipstick tube to refill? Have not really looked round the engine bay. 

Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
26 minutes ago, GMC4Zee said:

I may have to try another dealer. My last towing outing the temps got to 225 degrees. Yes it cooled down once I hit the downhill but that is crazy hot. This is in PA mountains towing a 12K 5th wheel. I will try the other dealer in the area and if not then i will do it myself. It is just an externa module that bolts on, correct? Other problem is if you lose any fluid, do we not have a dipstick tube to refill? Have not really looked round the engine bay. 

I personally don't know how to change the module but I have seen videos on youtube explaining how to do it if that helps.

  • 4 weeks later...
Grjfer Enthusiast

Grjfer

Posted
Posted
On 12/18/2022 at 5:28 PM, Jettech1 said:

If you use tow/haul mode 6th should be locked out already.  Are you using that mode?  If not, towing a 5th wheel that I'm guessing weighs quite a bit could be all of your problem.  Try tow/haul mode.  Hopefully problem solved. 

Just an FYI concerning tow/haul mode. Per my owners manual page 288: Tow/haul mode is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicle's Gross Combined Weight Rating GCWR.

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Jettech1 Senior Enthusiast

Jettech1

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Posted (edited)
2 hours ago, Grjfer said:

Just an FYI concerning tow/haul mode. Per my owners manual page 288: Tow/haul mode is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicle's Gross Combined Weight Rating GCWR.

I appreciate that.  Thank you sir.  But I have to ask, what does page 287 say?  Just curious is all...

Edited by Jettech1

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