No noises just motor. No slipping sounds are anything. Really has me baffled. As it will engage while on jack stands.

Thanks looks like I will be pulling the tranny out.

I have done them twice just to make sure. Following what was in manual. Have went over everything that I can think of and still scratching my head.

Recently rebuilt my C5 tranny that I have in a 90 Jeep behind a 302 with a Dana 20 attached to it that at the time I twin sticked. When rebuilding the tranny I replaced all seals, O-rings, clutches, bands, modulator and gaskets. Air checked both pistons and bands for operation and all worked as...