[Sandman76]

Wrong fluid used. Must be ATF+4 not the dextron/mercon used in GM trannies. Might now be the issue but throwing it out there as a possibility. You may also have had a plugged tranny cooler (which he should have flushed out anyways as part of the job). Did he put in new tranny pump or used the old one on the cheap?

 

[crazyrunner33]

You need a transmission pressure and temperature gauge to keep an eye on things. Edit: Saw that you posted "at the time". What kind of temperatures have you been seeing?

 

[twoduners11]

You need a transmission pressure and temperature gauge to keep an eye on things. Edit: Saw that you posted "at the time". What kind of temperatures have you been seeing?

truck isnt back together yet, now the company that built the converter wants it back to open up and inspect

 

[twoduners11]

Wrong fluid used. Must be ATF+4 not the dextron/mercon used in GM trannies. Might now be the issue but throwing it out there as a possibility. You may also have had a plugged tranny cooler (which he should have flushed out anyways as part of the job). Did he put in new tranny pump or used the old one on the cheap?

used the correct fluid, but i know the coolers didnt get flushed out. the last tranny didnt break it just sucked from the last re-build (another shop owner owed me some money at the time)
if a cooler was really plugged wouldnt the pressure be low and the trans not shift right? this thing worked like a freight train, seriously it was like the truck got 2 more cylinders in it

 

[budvoss]

not trying to bust balls but one should always flush cooler and lines any time trans is off. Im also thinking trans will still work with a bad cooler just run hot

 

[dozer12216]

Correct as stated above.
Plugged, restricted, collapsed lines, or incorrectlly connected coolers will just allow to run hot with inadequate flow. Flush and prove flow on all tranny rebuilds!!!!!!!!
Some cooler circuits have a theromstat in line that can bypas cooler if not working. It will also flow when cold and plugged.

 

[mattyboy72]

if its a good tranny shop they'll have one of them fluid pump deals that forces the fluid into the entire trans, may have had a blockage and it didnt fill completely up, see what they say when they rip it open

 

[twoduners11]

truck is all back together and picked it up tonight. new flexplate, converter, input shaft and pump now it idles rough and has a knocking. i drove it home, seems like the power is ok and the knocking doesnt get really loud when you get on it a bit its just kinda there. as far as the rough idle i would swear the balance weights fell off the flexplate but there is no balancing on them?:S: