im posting this for a friend(customer) of mine we cant figure out what it is

tranny started slipping wouldn't shift to 2nd gear I would have to let off the gas so tried changing shift solenoids...it didn't work so dropped tranny... got it rebuilt by aj's.. replaced everything bolted it up and tested it out.. tranny didn't work in ''D'' it starts in 2nd gear and has no over drive?? so we took it apart again and rechecked everything nothing was wrong...but replaced servo and solenoids but still nothing...next tried neutral saftey switch and nothing still did the same..so took it to llavero to check the tune said everthing was okay so we tried and different pcm and tried several tunes and nothing now I have eliminated all these componets what else could be i'm breaking my head and can't figure it out! anybody ever experience anything like this?? it driving me crazy...anybody got any idea?? any input is welcome. thanks

 

i know this is off the wall suggestion, but do you have another transmission that you could possibly try??

 

What type trans is this?

 

4l65e tranny out of an 2006 chevy 4 door

 

so it shifts from 2-3 and thats it? Does it have reverse? Is there a shift kit or any aftermarket parts in it? It sounds like something internal to the trans, could be alot of things.

 

sounds internal to me

 

that doesnt seem like a normal problem they have... could be a valve somewhere that wasnt put in right if they were taken out.

 

Truck was working great, then all of the sudden it started having that problem. No codes or anything, tranny starts off in 2nd and shift into 3rd, No 1st unless it is manually put into 1st. Truck has no 1st or 4th at all even with me logging the truck and commanding each gear with the vcm controls. If i log current trans gear it shows it's in 1st but it not and then it get to 3rd and shows it shifts into 4th but the trans doesnt. Owner tried everything as my brother mentioned above and even tried a different tranny. I already tried a different ecm and different tunes and I know it isnt the tune because it was working great for some time and all of a sudden it started doing that.

 

Have check the pins in the plug to make sure it has good connection.

 

more help welcomed guys any other ideas