Automatic Transmission Gurus - 32RH

[lpukas2]

Just rebuilt a 32rh with new torque converter. Shifts through the gears fine, kickdown works. Just noticed yesterday that while on my jeep is on my steep drive way, it will roll backwards while in drive with no throttle. This is with it warmed up to temp and the oil just checked. About an hour later, took it out of the garage and stopped on the drive way and it did not happen. But after a 5 min drive, it did it again. Does hold while in park.

Any thoughts?

 

[Ghetto Fab.]

Cold idle rpm vs warmed up idle rpm? Usually cold is a higher idle rpm and maybe its enough to hold the vehicle there, whereas once things warm up its just not enough. My yota will pull the through the brakes in double low when cold, but its no problem once warmed up.