Rear ends

olebusman · January 01, 2011, 11:21:13 AM

Does anybody know if the ring and pinion out of a 1982 Grumman? flex will fit my 4106. Don' want to pull for the fun of it. Thanks olebusman

Geoff · January 01, 2011, 04:35:05 PM

The only thing the Flex/Grumman ring and pinion will interchange with is an RTS. I have a couple sets of them lying around if anyone wants some city gears-- 60 and 65 mph.

olebusman · January 04, 2011, 08:29:03 AM

Geoff, is that because the RTS is an angle drive? My 4106 is also a angle drive. I can't imagine to many manuf. making angle drive rears. Does anyone know?

olebusman

Geoff · January 04, 2011, 10:26:21 AM

The Flex/Grumman/RTS differential is made by Rockwell-Merritor. As far as I know it is not interchangable with the 4106 rear end. Two different V-Drive differentials years apart.

BTW, what is the gear ratio of the rear end you found? A 4:56 or 4:10 are in demand on the RTS Yahoo board.

--Geoff

white-eagle · January 04, 2011, 06:42:01 PM

aw shucks, i was lookin for pics of some great rear ends, not bus rear ends. ;-).

Mex-Busnut · January 04, 2011, 09:22:02 PM

Well, Tom (alias White Eagle): Glad to oblige. Here are the pictures you requested of great rear ends. I am sure your wife won't get jealous...

Dr. Steve, Mex Busnut

olebusman · January 05, 2011, 10:41:36 AM

Geoff, I have the 4 1/8 rear now. I installed a Teal o-drive in my V730 and could use a 4.56 rear to give me less top speed and more startability. olebusman

gm4106 · January 05, 2011, 03:53:31 PM

Teal o-drive in my V730 Hmmmmm whats this?

buswarrior · January 05, 2011, 05:51:49 PM

Bill Teal put together a collection of parts from other earlier models of Allison v-drives to get an overdrive tucked into the front end of a V730/V731.

He then made the plans available to others.

Besides olebusman, Bill Gerrie has one, he hangs around on BNO and the GM Yahoo group.

There are a few others.

happy coaching!
buswarrior

RJ · January 05, 2011, 07:56:32 PM

Olbusman -

Geoff's right about the rear axles out of a Grumman Flx and the RTS - both made by Rockwell/Meritor. The OEM rear axle in the 4106s was made by Timken, IIRC. Maybe Geoff knows if you could swap the entire rear axle from a 96"-wide Flx or RTS, rather than just the pumpkin, into your '06.

Or, you might try an axle out of a Fishbowl. I know of one '06 owner that used a 5:36 so that his VS2-equipped '06 wouldn't slow to a crawl for a freeway overpass.

FWIW & HTH. . .