Truck Dies when put in reverse.

[mike]

need help. 1987 Chevy 1/2 ton 4 wheel drive, 350 tbi, 700r tranmission. dies when put in reverse.

 

[lusktommy]

need help. 1987 Chevy 1/2 ton 4 wheel drive, 350 tbi, 700r tranmission. dies when put in reverse.

does it die only in reverse or foward gears too?

 

[crazy4offroad]

Check for vacuum leaks.

 

[mike]

to be continued

need help. 1987 Chevy 1/2 ton 4 wheel drive, 350 tbi, 700r tranmission. dies when put in reverse.

Thank you for those replies! yes it only dies in reverse! Yes it has been checked for vacum leak(s). I took it to a very good shop, the owner has just been tinkering with on his free time. He has also had his onther mechanics look at it . So far nothing, the latest tthinking is the torque converter.

 

[Old77]

Didn't give us much time to assist you before dropping it off at a shop :/

 

[lusktommy]

Thank you for those replies! yes it only dies in reverse! Yes it has been checked for vacum leak(s). I took it to a very good shop, the owner has just been tinkering with on his free time. He has also had his onther mechanics look at it . So far nothing, the latest tthinking is the torque converter.

i was going lean towards the torque converter, any strange noises when you put it in reverse that you dont normally hear from a square? from my experience with torque converters going out and locking up they will kill the truck instantly and and you will feel the truck try to move backward or forwards. but i dont think it would do it just in reverse and not in any forward gears, thats strange, do you get any movement out of the truck before it completely dies?

 

[lusktommy]

Didn't give us much time to assist you before dropping it off at a shop :/

i agree but i dont think its going to be a quick and easy fix, a good mechanic would normally start with easy fixes and then work he way up to the more serious problems and if they havent found yet and there has been multiple mechanics look at it and they are experienced with old squares they would of got any of the quick and easys that would of been wrong, oh damn i forgot it was a 4x4 have your tried putting the transfer case in neutral and putting it in reverse? C4 and HR will be on later and they can prolly give you better advise

 

[crazy4offroad]

Try putting it in Lo-1 (1st gear) and see if it dies. If so, there isn't enough clearance in the 1st/reverse clutch pack. Beyond that you need a more experienced trans guy to help diagnose this lol.

 

[lusktommy]

Try putting it in Lo-1 (1st gear) and see if it dies. If so, there isn't enough clearance in the 1st/reverse clutch pack. Beyond that you need a more experienced trans guy to help diagnose this lol.

C4 correct me if im wrong but in a 700R transmission 1st/reverse are on the outside of the shell in the transmisson and are direct drive, if so then it should die in low and reverse

 

[crazy4offroad]

Not sure about 700R4, I think it is all the way in the rear of the trans, behind the sunshell.

 

[mike]

thanks for the response

i was going lean towards the torque converter, any strange noises when you put it in reverse that you dont normally hear from a square? from my experience with torque converters going out and locking up they will kill the truck instantly and and you will feel the truck try to move backward or forwards. but i dont think it would do it just in reverse and not in any forward gears, thats strange, do you get any movement out of the truck before it completely dies?

No strange noises! The truck will move it does not die. A friend says it sounds electrical like a short.

 

[Jims86]

No strange noises! The truck will move it does not die. A friend says it sounds electrical like a short.

The only thing that would short in reverse is the reverse lights.

 

[lusktommy]

The only thing that would short in reverse is the reverse lights.

im not aware of anything that would short out that would kill the ignition like that if thats what is causing his problem

 

[lusktommy]

The truck will move it does not die.

wait i didnt get that really well, plz clarify that.

 

[mike]

my truck is fixed!! bad ecm and prom . installed a use ecm and prom truck runs great.