so we just installed the tranny but it will drive but not shift out of 1st....
what could cause it? its an automatic valve body tranny

 

could it be that the tension on the spring is not letting hydrollic pressure though?

 

Have you reprogrammed the PCM to run a 4l80e? Or verified that shifts are even being commanded ?

 

the tuner said that he did do that....

 

What are you using for transmission controls?

 

what was it tuned with? do you have a tune file? (i can only possibly help if its efilive) what is it in and what harness? how do you have it wired?.etc...etc..etc......

 

Are you sure it is in 1st? Verify that it is, i think its in 2nd. It automatically faults into 2nd gear in a limp home mode. I had this when first intalled, I had a few issues...
First...I didnt have the proper bin file, i took the bin file information i was sent and loaded it to my M6 file (wrong) you have to use the new bin file and load any motor or other info onto the new file.
Also i didnt have both speed sensors wired up on the side of the tranny, not really related to this i dont think but something to check.