Alas, this is not boding well.
Could be a puter issue, rare but it happens.
There are a few ways these things die that arent worth repairing (as there is an ample supply)
- Loss of Reverse - Clutch is cooked
- Loss of 4th (will ever slip or wont upshift) Eventually third will be lost too.- cooked clutch pack
- Will not upshift from 1st - Pump can not make enough pressure to upshift.
On some years there is a shuft dealy from R to D but that is solvable.
The next step would be if you wanted confirmation is to have a real tranny shop look at it and take some pressure readings. You may luck out and have it be a valve body issue.
You can also try disconnecting the transmission harness plug that is under the hood (I have to look to see which one it is, its a large one) that forces the transmission to go into limp mode and shift purely mechanically. That totally rules out anything computer related
Did this happen suddenly or has it been acting oddly for a while.
Edited by nipper, 11 February 2014 - 04:21 PM.