I'm away from home and can't access the material that would answer this question that was asked by a colleague. Hopefully Morris 1100 is not far away.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Sorry to say I don't really have a full answer for that one. The XE somehow refers to a 4 syncro gearbox.

All the Cooper S codes are silly. Sticking a 9 in front of them to try and fool the FIA that the 1275 is really a continuation of the 997.

p71 of John Parnell's book "Original Mini Cooper and Cooper S" just states `Introduction of 4 speed all-synchromesh gearbox'.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

The XE means its a 4 synchro close ratio box ie Cooper S ratios.
When you compare it to the 3 synchro Ta/Sa boxes where the T means standard ratio and the S means close ratio/Cooper S and the a means 3 synchro, then the X probably refers to close ratio and the E means 4 synchro box.

RonR

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68 build Mk1 Cooper S
72 Clubman GT project. Total restoration required

the gearbox case should have XE stamped on the front too

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did I tell you that I won a trophy?