Death Of A 4L60

[retorq]

That is why you keep the liquid to liquid cooler in the radiator hooked up ... in the winter it will warm the trans fluid quicker. If you have a bigger stall convertor you won't have an issue getting the fluid up to temp though ...

 

[BigDaddy13440]

That is why you keep the liquid to liquid cooler in the radiator hooked up ... in the winter it will warm the trans fluid quicker. If you have a bigger stall convertor you won't have an issue getting the fluid up to temp though ...

You guys just answered my next question in my thread before I asked it.

http://www.tahoeyukonforum.com/forum/showthread.php?t=37113

I would assume with the thermostat being stuck open, the coolant never gets anywhere near the ideal operating temp... and in turn, the tranny fluid doesn't heat up either? That might explain why I'm not getting very good mileage, as it's not locking into OD for extended periods of time.

 

[Nickleahy23]

if tranny fluid is to cold tranny lock-up or OD will get locked out by pcm. I forgot which one at the moment.

the way mine is tuned..it wont lock or shift out of 2nd until higher rpm..when i leave the house on a cold morning, it stays in 2nd until 30-35 at a gentle throttle to warm things up, i hit the tow/haul which is tuned for the trans and it shifts..just a precaution built in i guess

 

[BattelWagun]

Mine simply won't shift into 4th/ OD while everything is in open loop. All shift points from 1-2 and 2-3 remain the same though.

 

[SunlitComet]

open loop was another disabler.

 

[BattelWagun]

Well, I finally got it back yesterday! Its shifts like its brand new! They were a little firm at first, but now after 60 miles or so everything is smoothing out. I'm very satisfied with the job. Everything came out to be $1800, $900 of which was parts, also had the t-case inspected cleaned and refilled.