The next job is a 2003 Chevrolet Venture Van with a 4T65-E transmission and all-wheel drive. It has an intermittant no drive or reverse when cold. It is fine after 5 minutes of warming up. I'm going to suspect an issue with the input clutch housing piston seal or piston itself. The reason I suspect this is that it is a common issue and I have no codes set. It also happens in both drive and reverse and my line pressure is normal when it is occurring. Sure enough when it is removed and pulled apart, the input clutch piston seal is shredded and the inner piston surface that rides on it is deformed somewhat. I replaced the affected parts, the seal and piston.

This job is a major pain in the rear to remove and reinstall (as opposed to the regular non-all wheel drive Venture) as it has a transfer case attached to the end of the tranny making cradle removal difficult and power steering rack removal mandatory.

Engine cradle and other parts removed to make way for tranny removal

Back of tranny showing transfer case.

Old input seal shredded

Pending common problem, fourth gear inner splines starting to round off

Other end of 4th gear shaft, hard to see sharpened splines on the right one, in this view

Venture tranny on bench in pieces