Would this servo work for sure with the 200-4R? I have tried to search the part # w/o much luck.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=8064326911&rd=1&rd=1

Does it have a greater surface area than the Grand National servo (8635694)?

Thx in advance!

THAT IS A JUNK SERVO.i sell the gn servo if you need one and i have authored a 200 page book on the transmission if your interested./http://www.ckperformance.com/resources/GM2004RTECHNICALMANUAL.html

The GN servo,the older 200C servo and the Fairbanks super servo are all good units.
Never heard of that one listed in the ebay auction

I would contact Chris from CK for anything that is related to the 2004R

Thanks guys!