[quikss]

Alright tranny genious's, I am having a problem with the tranny in my 93 4x4 chevy truck. Its a 4l60 tranny. It works fine in 1-2-3-R, my problem is OD. I can drive in OD but if I try to accelerate past someone or go up a hill or something the tranny begins slipping. It gets a little RPM going then engages again and goes until I need to accelerate again.

I did change the filter and found nothing significant in the fluid or filter. The fluid isn't quite the bright red it should be, but not real bad either. Before I changed the filter and after, if I pull the dipstick the fluid looks foamy.

Does this sound like a pump problem or something else? Also is a 4l60 user friendly, meaning is it something a tranny beginner could handle. I have never tore into a tranny before, so if its out of my league I will just send it in, but would prefer to save some money and do it myself.

Any advice?

Thanks, Jeff

 

[BB_Mike]

I can't help with the troubleshooting. But about 1 month ago, I rebuilt my 4L60E from a 97 Tahoe 4x4. It was my first transmission. Everything went pretty well. My problem was pretty obvious, in that I busted the Sun Shell (aka reaction shell).

If it comes to doing the rebuild, send me a PM. I don't check in on the tranny forum too often.

A local shop wanted $1200 for the labor alone.

I saved roughly $900, after it was all over.

 

[quikss]

Thanks for offering the help. I called a well known local tranny shop and he quoted me $1000 flat rate to do a 4l60 rebuild.

He did suggest a few ways to test on my own to see if I can figure out whats wrong with it and also said to warm up the tranny and bring it to him and he'll go for a ride with me and help me diagnois it. He said he won't rebuild it just for the sake of rebuilding if it is something minor.

I know him somewhat from the local dragstrip, real honest guy.

I guess I have some testing to do. He suggested it may possibly be my tranny cooler in the radiator plugging up and restricting flow. From what I told him its doing, he doesn't seem to think the tranny is actually at fault. I hope he's right.

Jeff

 

[Yelsorc]

Your 1993 4x4 truck should have a 4L60E unit. Have you checked?

I'd find a different tranny guy. If the radiator trans cooler is clogging up , it will be from trash from the tranny.

You need to diagnose the problem. A weak 3-4 clutch pack will cause problems in OD and 3rd gear may work OK.

You could have a weak shift solenoid.

Low pressure can cause the problem from a weak spring , worn boost valve , a weak force motor that controls pressure.

The band can be nearly burned up and it will hold power in 2nd gear and NOT hold power in OD since the 2-4 servo is a multi stage unit