[james w.]

My truck just stopped shifting form 2 to 3 as I was driving one day.Was told I needed a new trans. Had it rebuilt and put it in myself with a new converter.Pinched a wire on install.Had to take back out. Put it in and still not shifting from 2nd to 3rd.Had diagnostic on it.Put new cam sensor in,master air flow sensor,new shift solenoids,pressure solenoids, still the same. Gm dealer said possible valve assembly malfunctioning.My mechanic is air checking that now. Could it be the engine computer(ecm)? If so can I buy the one at Auto Zone and install it without it needing to be programmed.Please help.I have been without my truck for 6 weeks and I do landscaping. I am borrowing a vehicle right now. It does not seem to be the tranny.Could the dealer have missed something?

 

[Canyonaro]

Autozone doesn't sell PCM/ECU units. But there are many many places around on the net that does.

That said, it doesn't sound like a PCM to me, but others that know more will chime in soon.

 

[Johnny P]

I'd look real hard at the direct clutch circuit in the trannny. Possible problem in the servo or the valve body as well. May need to air check the trans.

Autozone doesn't sell PCM/ECU units.

They do around here.

 

[james w.]

Thanks. I will pass this on to my friend who is checking the tranny right now. We are looking at the seperator plate as well for possible wear.

 

[GM Loyal]

There are at least a half dozen places for leaks along the 3-4 clutch fluid passage.
I am assuming you have a 4L60E transmission.
The person who "rebuilt this transmission" should know about all of these "points of concern".
If they do not then they should not be rebuilding transmissions.
Take it to someone who knows what he is doing.