4r55e transmission problem

[blu4x5_II]

i put this transmission in about 4 1/2 yrs ago. got it from a junkyard paid $350. has served me well. recently it came up w/ code p0761, shift solenoid 3 not working or stuck on. changed #3 solenoid, same problem. now after i've been running say 30-40 miles truck at operating temp and i come 2 say a traffic jam. it doesnt want 2 stay in gear after that. i've read thru a lot of ur post and i do have the delayed 1st and reverse nvr really noticed it until i started reading this forum. but it's weird cuz it only happens under those conditions, i let it sit 4 a while and cool down and it runs like it always did. i'm thinking its a valve body issue more so than internal failure. any thoughts would be greatly appreciated. it also has code p1445 and p0401. code 1445 has been there for yrs i hear it has little effect on engine performance.

 

[BrooklynBay]

Welcome to this forum! I've deleted your other thread since it's a copy of this one. A junkyard transmission is always a gamble since you don't know its condition. Did you check the internal wiring harness?

 

[blu4x5_II]

probably should have when the pan was off. electrical that was my 1st thought but it doesnt explain 2 me at least why this only happens under certain conditions. if it was electrical it would happen when the link was disconnected not only under certain conditions. what is 2-3 flare i hear about.

 

[blu4x5_II]

a junkyard tranny is a gamble but this 1 has lasted 4 1/2 yrs for $350 i'll take it. also the reason i dont want 2 go that route now any 4r55e now that i would get from a junkyard would have at least 100k on it

 

[BrooklynBay]

A bad internal harness could cause intermittent problems.

 

[blu4x5_II]

i can understand that but always under the same condition electrical would happen sporadically

 

[blu4x5_II]

is glacier 991 still around, if so how can i chat w/him

 

[blu4x5_II]

and what about the delayed 1st and reverse, valve body issue correct. u also didnt answer my question on the 2-3 flare what exactly is it

 

[blu4x5_II]

oh and yes i will check the harness from #3 solenoid back some time this weekend. it still doenst explain 2 me why it only happen under the same condition. i forgot 2 mention that so far it has only happen in the heat of the day, i live in the dallas metroplex and it only seems 2 happen when outside temp it 100 degrees or more.