I probably can't give you any knowledge that you don't already know, but in the motorhome transmissions the 4000 series Allison transmissions are the big boys as far as I know, and are usually teamed with the big block diesels. The following website has been recommended as a good source for rebuilds. I personally don't have any first hand knowledge of this company, but at least it might get you started on your quest.
http://www.usdieselparts.com/specials.cfm
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Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))
2003 Fleetwood Expedition 38N 2005 Saturn Vue
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