(01-01-2022, 01:46 PM)Russlin Wrote: Gearbox case, 'SM 4020' with 'L' above Austin name RHS.
The gearbox case numbers appear vertically on the right side flange near handbrake boss, would any of our readers know whether SM 4020 is a significant number?
The number on the gearbox is stamped on the near side front "ear" of the bellhousing on early boxes.
This one is 283A which translates to 10283 (assuming the missing zero), which is 1925 I believe. The box has XL + 3 digit part numbers all over it.
The number was stamped above the output shaft on later 3 speeds.
SM 4020 may be a casting number or foundry reference??