I've got a bit of a mess that came into my shop. I have HP tuners but am by no means expericanced with it, i mostly just write files and log with it.
So here is what i have.
71 gmc c-10 2WD
08 LY5 / 4L60e swap (done at another shop)
no codes, engine runs good, BUT. the trans shifts 1-2-3-4 imediately upon take off, it will shift maunally thru each gear, but will not downshift at all, does come back down to 1st when stopped.
I'll attach the file i pulled from the ecm.
im thoughts are that by the VIN # (from a 4x4) that there is either a 4X4 difference in the TCM tune or that the TCM is not getting written to? the TCM and ECM are not from the same doner to my knowledge.
So, what i have come up with is to use a known 08 2WD Vin # and get GM dealer to flash tcm/ecm to a stock file and then disable my VATS and cats etc?
any help would be greatly appreciated
Thanks, Gerry Foster.
P.S. please note i didnt not write this tune, i just uploaded it out of the truck....