Auxiliary Transmissions

Clutch, transmission, rear axle

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Auxiliary Transmissions

Postby raceopenwheel-2017 » Thu Jul 06, 2017 1:43 pm

Posting this link for those who may want to add a secondary transmission for under and overdrive capability.

FORD used the Spicer 5831-D Auxiliary Transmission -


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Re: Auxiliary Transmissions

Postby basketcase0302 » Thu Jul 06, 2017 3:33 pm

Old Skool dude...they are called Brownie Box's": :wink:

SOLD-71 F-350 dually flatbed, 302 / .030 over V-8 with a "baby"C-6, B & M truckshifter, Dana70/4.11 ratio, intermittent wipers, tilt steering, full LED lighting on the flat bed, and no stereo yet (this way I can hear the rattles to diagnose)! SOLD!
Many Ford bumps / one 76' EB / and several dents through the years.
A lot of "oddball" Ford parts collected from working on them for 34 years now!
2008 Ford Escape 4 x 4

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Re: Auxiliary Transmissions

Postby Lee » Sun Jul 09, 2017 9:15 am


Another source is Advanced Adapters, Ranger Torque Splitter. ... -units/91/

I installed one on my 1970 Highboy a few years ago.


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5831-D and 5831-E

Postby farmallmta » Thu Aug 31, 2017 9:35 pm

Ford used the 5831-D, but the 5831-E could be ordered in its place.

Here's the difference between them.

The -D gave the truck a second set of gears for starting a very heavy load out with a relatively small and underpowered engine. Think Y-block, 6cyl, 331-361-391 FT engines. It's amazing how much load the truck can have on it if you have a -D brownie. It's a doable workout for the driver to row all those gears.

The way the -D is shifted, depending on the primary transmission gearing is Brownie 1 and primary trans 1-2-3-4-(5, if a Clark), then shift the brownie into 2nd and then the primary back to 1 or 2, then 3,4, (5 again). Then once you're rolling good, you shift the brownie in and out of overdrive depending on inclines, declines and traffic speeds. The primary transmission makes a difference on the shifting pattern. It could vary.

An -E is shifted with some serious continuous rowing of gears, primary and brownie both, since it's more of a true under-direct-overdrive. I don't even want to get into the wicked ways of that, but you can watch shifting videos on you-tube. Better really love shifting! The nice thing about the -E is that once you're in top gear on the highway, you have direct drive, then underdrive for slight uphills and overdrive for downhills.

I robbed a brownie off an old grain truck that had a -D brownie in it, and put it behind a 6.9L diesel and T-19 4spd with 4WD, 4.10 axles, back axle had positive locking. Just for fun one time, I left the front hubs uncoupled and tried the T-19 granny plus 4WD Lo plus Brownie 1... amazing how slow that was. I think you could go eat lunch and come back to find it maybe traveled 30 feet. On the plus side, I could pull 2 10,000lb fertilizer carts from town hooked to a DMI Quik-Cush'n bumper. At the same time. Glad I never had to make an emergency stop!

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