4r100 troubles

[kromewldr]

tranny seems like it is trying to pull itself out of lock-up at speeds above 40-45 mph, almost like you are shifting it into neutral, but only briefly. trans was rebuilt at 44000 upgraded with a triple lock convertor (junk!!!) and a transgo tugger 2 shift kit, at 72000 trans was disassembled (gutted said triple-lock) and od clutch pack replaced, and new single-lock convertor installed (runs cooler and launches much harder) put new manual positioning lever sensor on and no help. finally it threw some codes of po750 and po713 which indicate trans temp too low, any ideas?

[straycat]

Not sure, whats up with that, do you have a programer or chip in it that may affect the tc lockup? I suppose you checked for low fluid and leaks?

Gord.

[kromewldr]

removed superchips about a month ago, fluid only has 10000 miles on it, not burnt, full to middle of hot mark (when hot) only thing I can think of is possible electrical malfunction, not as though I don't know how to do a tranny but this one has me totally baffled

[bigcountrysg]

Trans Temp to low is that freakin possible. With a trans you want it as cold as possible I would think. Overall how does the truck run. Does it feeli like it is slipping or not shifting properly.

[kromewldr]

truck running and shifting fine, but what i think is going on is temp sensor in tranny is not relaying to computer

[bigcountrysg]

Hey I noticed your another michigander, If you would like if your not to far away I can come up with some stuff and help you trouble shoot this problem. I like little road trips I am going to great lakes crossings tomorrow to look at one truck. I will be at the bass pro shops checking out the truck in the parking lot. shoot me a pm let me know where your at.