Muncie M21 / M22 4 Speed (RWD) Manual Transmission Parts

These quality M21 and M22's manual transmission parts, rebuild and overhaul kits are designed to be top of the line overhaul kits. We have include information on how to identify individual transmissions, application information, model year, detailed kit and part availability by transmission type. Muncie transmissions are covered in this section M21 and M22's, rear wheel drive (RWD), requiring 4 speed applications. The Muncie 4 speed manual transmission was use by General Motors in Buick Special, Special Deluxe, GS, Lesabre, Wildcat, Electra, Century, Centurion, Skylark and Regal. Chevrolet Belair, Biscane, Camaro, Chevelle, El Camino, Impala, Malibu, Corvettes, Nova and Chevy II. GMC Caballero and Spirit. Oldsmobile Cutlass, Jetstar, Cruiser 88, Delmont, Delta, Dynamic, F88, Omega, Starfire, Vista and 442. Pontiac Catalina, Firebird, Trans AM, Grand Prix, LeMans, Lemans GTO and Tempest.

Bearing overhaul kits are available depending on the extent of the overhaul that you plan, the contents of the kits are described as follows:

IDENTIFICATION - Aluminum case, extension housing and side cover. The side cover has 7 bolts and 2 shifter cams. The synchro rings have 36 teeth and the unit has a 4-step cluster gear. Reverse gears are helical cut and are located on the extension housing.

We provide parts in three separate categories for the Muncie M21 / M22 4 Speed: Overhaul kits by application include standard kits, heavy duty kits for more horsepower and "WS" kits that include both bearings and syncro rings as well as gaskets and seal for Buick, Chevrolet, GMC, Oldsmobile and Pontiac. Plus we off a large selection of miscellaneous hard parts.

The close ratio gearboxs generally came with 3.73+ gear ratio'ed cars. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox.  Identification and ratio information is provide below these groves are typically cut across the clutch spline on the input shaft:

Muncie 4speed
Number of ID Groves	1st	2nd	3rd	4th
No groves	2.58	1.91	1.48	1.00
1 grove	2.20	1.64	1.28	1.00
2 grove	2.52	1.88	1.48	1.00

Kit