The Stovebolt Site Forums The Parking Lot Big Bolts Gearing Options for a 3 ton?

Nice truck! A Brownie(Brown Lipe) aux. transmission is somewhat easy to install in the middle of the driveline. A tag on the side lists MN. They are sizes according to ENGINE torque, I e 5531, 550 torque capacity. 6241 600 ft. lbs. torque capacity. Anything larger, 7000 series, would be too large for your truck. Look around in wrecking yards, don’t bother calling, they won’t know what you are talking about, might jack up the price, make sure to get the shift lever assembly from the cab. Shift linkeages are easy to make from water pipe or EMT. Easiest way to ID is to look for add’l shift lever in cab.

Almost all are 3 speed, some are 4 speed, under, direct, OD, corresponding to 3rd number in MN. OD would correspond to shift lever in cab being fwd against firewall, to the right. Most come with Tru-stop disc brakes on the aft end which will replace the existing brake on the rear of your 4 speed. Brake belongs on last location before diff, otherwise if rear trans. is in neutral, no brake. Google ‘Brownie or Brown Lipe’ for ratios. Early one had brass gage, later steel tape. There are no parts. No rear seal, reverse threads keep oil in. All are non-synchro, easy to shift.

Ed