Is there a repair manual for Mercedes 722,5 transmission out there to buy that is better explained than ATSG manual which I already have? I have never worked with a automatic transmission before and if anybody have some expertise tips for me I am grateful for that. The car is E320 1994 with 800,000 miles on it and I lost the famous reverse but when I dropped the pan the oil is like new and no other signs of failure I believe the lip-seals is bad.

Another problem is when I come to a stop sign and completely stop the car for a second and then hit the throttle the gears slam in very hard, if I stay for couple more seconds there is no problem the transmission shifts fine. Is anybody now which part I need to look in to find the problem for that.
I am going for a complete overhaul with friction disk and sealings, other parts I only change if there is signs of wear.