Gearbox Casings and Part Numbers
Label Part No Description Quantity Comments
1 22A102 Casing Number 22A104 - 850cc Cone synchromesh, magic wand 1 N.L.A.
1 22A150 Casing Number 22A145 - 850cc Cone synchromesh, magic wand with smaller 62mm double roller 1 N.L.A
1 22A364 Casing Number 22A363 - 850cc Cone synchromesh, magic wand 62mm 1 N.L.A.
1 22G66 Casing Number 22G68 - 850/998cc Cooper ‘A’ and ‘B’ type remote or magic wand 1 N.L.A.
1 22A1294 Casing Number 22A1288 - 850/998cc Mini ‘B’ type magic wand 1 N.L.A.
1 22A1286 Casing Number 22A1289 - ‘A’ and ‘B’ 1 N.L.A.
1 22G385 Casing Number 22G382 - 850/998cc Mini ‘B’ type magic wand 1 N.L.A.
1 22G188 Casing Number 22G190 - 970/1071cc Cooper ‘S’, ‘A’ and ‘B’ gear remote type 1 N.L.A.
1 22G331 Casing Number 22G333 - 970/1275cc Cooper ‘S’, ‘B’ type 1 N.L.A.
1 22A1294 Casing Number 22A1228 - Non ‘S’, ‘B’ remote type 1 N.L.A.
1 22A1529 Casing Number 22A1522 - Last ‘B’ type for Mini and ‘S’ 3 synchromesh remote type 1 N.L.A.
1 22G1338 Casing Number 22G1128 - All 4 stnchro with remote 1 N.L.A.
1 22G2383 Casing Number 22G1832 - Rod change with small idler bearing 1 N.L.A.
1 DAM3755 Casing Number DAM4818 - Rod change ‘A’ plus with 4 bolt bearing retainer 1 N.L.A.
1 BHM5045 Casing Number DAM2886 - Rod change ‘A’ plus with 4 bolt bearing retainer and stronger idler housing 1 N.L.A.
1 BHM5093 Casing Number DAM5626 - ‘A’ plus with 3 bolt bearing retainer 1
Gearbox Casing and Part Numbers
Casing No. Part No. Description Comments
22A104 22A102 850cc Cone synchromesh, magic wand N.L.A.
22A145 22A150 850cc Cone synchromesh, magic wand with smaller 62mm double roller N.L.A
22A363 22A364 850cc Cone synchromesh, magic wand 62mm N.L.A.
22G68 22G66 850/998cc Cooper ‘A’ and ‘B’ type remote or magic wand N.L.A.
22A1288
 22A1294
22A1286 		850/998cc Mini ‘B’ type magic wand
'A' and 'B' 		N.L.A.
22G382 22G385 850/998cc Mini ‘B’ type magic wand N.L.A.
22G190 22G188 970/1071cc Cooper ‘S’, ‘A’ and ‘B’ gear remote type N.L.A.
22G333 22G331 970/1275cc Cooper ‘S’, ‘B’ type N.L.A.
22A1228 22A1294 Non ‘S’, ‘B’ remote type N.L.A.
22A1522 22A1529 Last ‘B’ type for Mini and ‘S’ 3 synchromesh remote type N.L.A.
22G1128 22G1338 All 4 stnchro with remote N.L.A.
22G1832 22G2383 Rod change with small idler bearing N.L.A.
DAM4818 DAM3755 Rod change ‘A’ plus with 4 bolt bearing retainer N.L.A.
DAM2886 BHM5045 Rod change ‘A’ plus with 4 bolt bearing retainer and stronger idler housing N.L.A.
DAM5626 BHM5093 ‘A’ plus with 3 bolt bearing retainer  

3 SYNCHROMESH

The original Minis gears were known as cone type synchromesh, which had a brass baulk ring fitted to the gear. These were replaced in October 1962 by the conventional type of baulk ring as used today and became known as ‘A’ type gears. ‘A’ type gears were used up until September 1964 when ‘B’ type gears were introduced, which had to be fitted in complete sets if interchanging with exception to the Cooper ‘S’, which had a 22G204 laygear manufactured to accept ‘B’ type 1st and reverse gears 22A1021 and 22G202 respectively.

‘A’ type gears have a much steeper inclined helical cut which is very noticeable when placed side by side. The ‘A’ type 2nd and 3rd gear both run on bronze bushes whereas ‘B’ type run on 26 small rollers per gear. The ‘A’ type 3rd motion shaft (main shaft) has a smaller nose to accept the 1st motion shaft which has a fixed sleeve bearing which is obsolete and not replaceable. The ‘B’ type 1st motion shaft had a free fitting needle roller bearing, which slides in and out freely. Apart from the 22G204 laygear all ‘A’ type laygears had a circlip recess 1/10” from the ends to hold the layshaft bearings in. All ‘B’ type laygears plus 22G204 had the circlip recess 1” in to stop the bearings moving into the gear, but easily sliding in or out when the gear is not fitted.

4 SYNCHROMESH

At the end of 1968 the 4 synchromesh gearbox was introduced, which had all different gears and ratios. The bearing housing at the clutch end of the gearbox case, which housed the 1st motion shaft roller bearing was machined THINNER on the inside of the gearbox case to help accommodate the extra 1st gear.

ROD CHANGE 4 SYNCHROMESH

Beginning of 1973 the remote gear lever housing extensions were replaced by two external rods, hence the name rod change gearbox Internally the three selector shafts were replaced by one.

About 1982 ‘A’ plus gears started appearing. which were identified by having a groove mark in the middle of the teeth on 2nd/3rd gear, 1st motion and 4th gear on the laygear. These were cut at a different tooth angle making the gears (less noisy) with different ratios again.

About 1984 the centre main double roller retainer was changed from 4 holes to 3 holes as the case tended to crack where one of the locating holes for the retainer was drilled.