Gearbox Internals

Small metal plate that locks the layshaft in position in most Classic Mini gearboxes. Ref: 2A3581.

An improved layshaft featuring superior material specification and precision machining. Ref: C-22A1731, STF0011HD

Single-step layshaft for 4-synchro remote and early rod change transmission. Ref: STF0012, 22G931, 22G0931.

Single-step layshaft for four-synchro remote and early rod change transmission; made from a special grade of steel (EN36). Ref: C-22A1738, 22A1738.

Competition-quality A+ 3-step layshaft; precision-ground, fully heat-treated to exacting specifications.

An improved version of the 3-step A+ layshaft, using a superior material and tougher hardening. Ref: C-22A1739, DAM3187.

Locking peg as used on Austin and Morris Minis with 3-synchromesh manual gearbox. Ref: 22A0459, 22A459.

Metal locktab set for classic Mini gearbox/transmission and flywheel housing. Ref: 18G8085.

Locktab for double ball bearing on the 4-synchro gearbox mainshaft. Ref: DAM2377.

Locks the input gear retaining nut on all classic Mini models. Ref: DAM4000.

Locktab for final drive pinion nut on transmission mainshaft. Ref: DAM6140, 22A0613.

Mainshaft for four-synchro transmissions up to 1979. 14mm nose. Ref: 22G833, 22G0833.

Identifiable by its 18mm nose, this shaft was strengthened in 1979 to allow a larger bearing to be fitted inside the first motion shaft. Ref: DAM7484.

This nut is slightly different from the ones on pre-A+ transmissions, so the correct one must be used to match the main shaft.

Standard replacement oil drain plug for classic Mini A-series engines, with fragment-trapping magnet on the end. Ref: DAM7335, 42H1022.

This extended-length drain plug is superior for this task in that it puts the magnet at the point where the oil is scavenged, not over in the corner like the stock plug. Ref: DP1, STF0015.

Self-tapping, oversized drain plug, to be used when the threads have become damaged or stripped. Ref: DP2, STF0114.

Stainless steel oil drain plug, with high-strength neodymium magnet to capture ferrous material suspended in the oil. Ref: DP3, STF0113.

Keith Calver floating front bush to fit primary gears with 1.75" bore. Fits with no modification or honing required. Fits 1275/1300 primary gears with 1.75" diameter, but will not work

Forked, metal retainer that holds the threaded speedometer drive to the transmission.

Reverse gear for early rod change transmissions, as used from 1973 untill the introduction of the A+ gears.

Reverse gear, fits all classic Mini rod change transmissions. Single internal bushing.

Reverse gear for 4-synchro straight-cut racing transmission. Tooth count 16 & 18. Not for rod-change transmission. Ref: C-22A1736.

Roll pin used to lock the shift for the the selector shaft on rod-change transmission. Used on both the 1-2 and the 3-4 shift fork.

Used second gear for late SPi classic Minis, usually from France, with 25 tooth 2nd gear. Ref: DAM6240.

Second gear, as fitted to most standard ratio A+ transmissions. Identified by 26 teeth and a single identifying groove around the perimeter of the gear teeth. Ref: DAM4932.

The detent ball for the gear selector shaft on the rod change transmission is located under the right diff side cover

Shift fork for first/second gear in pre-rod change 4-synchro transmission.

First-second gear shift fork for rod change transmissions after 1973.

New-production 1st and 2nd shift fork for the classic Mini 3-synchro transmission. Ref: 22A611, 22A0611.

Shift fork for third-fourth gear for rod change transmission from 1973-on.

Shim, mainshaft double-row bearing retainer, .002''; for 4-synchro gearbox. Ref: GUG705645GM, 2A3714B, 2A3714/002, LKJ705645EVA.

Shim, mainshaft double-row bearing retainer, .005''; for 4-synchro gearbox.

Metal sleeve inside selector rod hole at the rear of rod change transmissions. Supports the pins. Ref: DAM8706.

Plate that covers the speedometer drive spindle, on the transmission end housing; used condition. Ref: 2A3626, U-2A3626, 2A3626-USED.

5-tooth metal speedometer drive gear in transmission. Typically used with 3.2 final drive.

Tiny spring that holds pressure against the detent ball in the classic Mini 3-synchro gearboxes. Ref: 22G317, 22G0317.

Baulk synchro ring that gives good service life for road-going transmission rebuilds. Ref: 22G2033, 22G2033MS.

CNC-machined synchro ring, heat-treated and finally grooved for accuracy and concentricity; similar to those produced by BMC in the '60s. Ref: C-22A1741, 22A1741.

First/second gear synchonizer hub assembly for all 4-synchro transmissions. Ref: DAM7455, 22G2263.

Reproduction first/second gear synchonizer hub assembly for all 3-synchro B-type transmissions, including the classic Mini Cooper S. Ref: 22A1021.

Third and fourth synchronising hub for all four-synchromesh (4-synchro) classic Mini gearboxes. Ref: DAM7456, 22G2264.

Third gear as found in a few A+ classic Mini transmissions. Identified by 20 teeth and twin rings marked around the perimeter of the gear teeth

Laygear thrust washer on 4th gear end which is one size only; fits all 4-synchro gearboxes. Ref: 22G860, 22G0860.

Small thrust washer at the end of the laygear in A+ boxes from 1979-on; 0.124''-0.126'' thick.

Small thrust washer at the end of the laygear in A+ boxes from 1979-on; 0.127''-0.129'' thick. Ref: DAM3182.

Small thrust washer at the end of the laygear in A+ boxes from 1979-on; 0.130''-0.132'' thick.

Protective aluminum oil spray shield designed to fit rod-change gearboxes, but can fit 4-synchro remote shift boxes with modifications. Ref: WIND01, MSKWBT, M8007.