A4S 310R Auto Transmission - No Reverse -

[shogun]

BMW A4S 310R = GM 4L30E
A cure for no reverse

If your car has suddenly lost it's reverse, it could be your Tcc soleniod, when this solenoid goes out your locked out of reverse. A replacement may be purchased at, Transmissionpartsusa under its GM name 4L30E, BMW calls it module A4S 310R this may work for other transmissions too. The part is called a Torque converter lockup solenoid for 1990-1999, Part number 81396A. there is another for 2000-on. you'll see it listed when you go online. the BMW number is 24331218916. I hope this saves some of you the cost of a transmission replacement. The other reason they go out is the clip scears off in the reverse drum and cracks it.
Transmission parts USA Automatic transmission parts (http://www.transmissionpartsusa.com/)

[shogun]

details to measure, Ohm etc on the valves
http://www.kneb.net/bmw/E46/Auto%20transmission%20info.pdf

if that link does not work, use this one with the wayback machine https://web.archive.org/web/20131008052600/http://www.kneb.net/bmw/E46/Auto%20transmission%20info.pdf

[shogun]

Revised ATF service (drain and fill capacity) for the A4S 310R and the A5S 310Z
https://wiki.bentleypublishers.com/display/tech/BMW+ATF+Service+for+A4S+310R+and+A5S+310Z+automati c+transmissions

[Russell]

Great information. Thanks!

[shogun]

GENERAL MOTORS® Hydra-Matic 4L30-E automatic transmission Assembly manual by Hans Verhoeven http://scottj.info/files/isuzu/4l30e.pdf

[Russell]

GENERAL MOTORS® Hydra-Matic 4L30-E automatic transmission Assembly manual by Hans Verhoeven http://scottj.info/files/isuzu/4l30e.pdf Wow. It's been a while. In 2012 replaced my failed trany with a remanufactured one from a specialist in CA, I live in KY. In my installed by an independent BMW shop. Been only 24,000 miles. However, i did change the fluid this year. 240,000 on the 95 525i and still going strong.