1988 735i 4hp22 reverse problems

[adriaxe]

I rebuilt the tranny. changing the friction plated and seals. new converter. the car has weak reverse when cool, no reverse when warmed up. all other gears work fine. i dropped the valve body and checked the reverse solenoid and the reverse lockout valve. i cannot find anything wrong with them. what else should i be looking at?

[shogun]

here might be some info to measure
http://www.europeantransmissions.com/Bulletin/BMWtechlib.htm