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Chris H · 10-03-2005, 01:00 PM

http://www.rverscorner.com/info/auxtrans.html

Here is a link to some information on the 2 currently marketed auxiliary transmissions. US Gear and Gear Vendors are the 2 main players, and mainly marketed to motorhome/rv folks.

I have 2 Doug Nash overdrives. (US Gear bought out Doug Nash, still lots of parts/support available). I bought one set up as a true auxiliary box, with a driveshaft yoke in and out. It would mount in place of a carrier bearing. My other unit bolts in place of the tailshaft on a TH400. I am planning on using the transmission mounted overdrive on my 72 C30 with a 402/TH400 and 4.10 rear.

Also see: http://www.6066gmcguy.org/spicer-5831-b.htm
This is information on an older Spicer auxiliary transmission with manual shifting. I cant see how you would get this one to shift on the fly with an automatic trans, but interesting anyways.

10-03-2005, 01:00 PM	#14
Chris H 72 C30 Trailer Queen Join Date: Dec 1999 Location: SE MN, USA Posts: 794	http://www.rverscorner.com/info/auxtrans.html Here is a link to some information on the 2 currently marketed auxiliary transmissions. US Gear and Gear Vendors are the 2 main players, and mainly marketed to motorhome/rv folks. I have 2 Doug Nash overdrives. (US Gear bought out Doug Nash, still lots of parts/support available). I bought one set up as a true auxiliary box, with a driveshaft yoke in and out. It would mount in place of a carrier bearing. My other unit bolts in place of the tailshaft on a TH400. I am planning on using the transmission mounted overdrive on my 72 C30 with a 402/TH400 and 4.10 rear. Also see: http://www.6066gmcguy.org/spicer-5831-b.htm This is information on an older Spicer auxiliary transmission with manual shifting. I cant see how you would get this one to shift on the fly with an automatic trans, but interesting anyways. __________________ Chris H 72 C30 133" 72 C30 157" flat-dump 69 C10 short fleet 71 ElCamino 2000 K2500 crewcab shortbed (sold, sorry old friend) 2005 GMC 2500HD shortcrew Duramax 2006 K1500 RCSB and a couple other projects/parts Last edited by Chris H; 10-03-2005 at 01:07 PM.