84 Chevy 3/4 ton

Chevy used a four-speed manual transmissions with overdrive in half-ton and light 3/4 ton trucks 1981 - 1986. They show up fairly cheap. It's a New Process NP833 - Chevy RPO code MY6. Used parts catalogs usually show it as a "side cover" trans, and the HD four speed you have as the "top cover" trans.
It has a torque rating of 270 lb. ft., 1st gear - 3.09. 2nd gear - 1.67, 3rd gear - 1, and fourth OD - .73, and reverse - 3. The later light-duty 5 speed - i.e. the NV3500 has an integral bellhousing and is rated for 300 lb. ft. of engine torque and a max. GVWR truck of 7200 lbs. Gear Ratio 1st 4.01
2nd 2.32
3rd 1.40
4th 1.00
5th 0.73

It was in a '67 Impala that belonged to an IBM salesman. Darned thing seemed to work okay, but I sure wouldn't wanna use it for any actual "work" other than running up and down the highway. :>)

Allan

My 82 Chevy K10 has a 6.2 diesel, 4WD, 3.08 axles and the NP833 trans. It has 220,000 miles on it and still works fine. But again, this is a light duty truck. Nice thing about having the 833 in a 4WD is - the option of using the transfercase low-range for a lower first gear.

The trans looks similar to the muscle-car Muncie M21. It comes in two versions - aluminum or cast iron case. All the 833s in my Chevy trucks are cast-iron.

Chrysler - I think - was the first to use the 833 trans in some of their older Hemi powered muscle cars.

I've got an old 1978 model, which has been totally converted to a '95 running gear/drivetrain.

Allan

• Hobby farm

Interesting scenario here, my K-10 snow plow truck has that heavy 4 spd and gear drive transfer case, changed er to a stick years ago too, was an auto, the truck may rust out beyond use, but that drivetrain won't be leaving here, it'll live in another one, so much easier to work on.

• Hobby farm