R55W Transmission Showing P0775, P0732, P0735

2004 Lincoln Aviator V8
Following information on the net, I have replaced the "coil pack" inside and also replaced the 2 servo pistons from outside. Problem persists, My son said he was getting off the highway and herd a clunk, overdrive light and check engine light came on. New filter and fluid at the time of the coil pack. Transmission shifts from 1st at high rpm, skips 2nd and goes to 3rd, 3rd to 4th is fine, no overdrive. Any ideas???

Thanks in advance

 

Sometimes the retaining ring will come out that keeps the OD piston in place. Check for that.

If you still have the same problem after replacing solenoid parts, that would tell us an incomplete diagnosis was done and now you need to look for the real problem which could be something like a poor electrical connection.