MG Laycock Overdrive Serial Number: A Guide to Identifying Your Unit

2. Gearbox ID number: the ID number on the box starts with VF. According to both my sources of Info (How to Restore + Moss Catalogue), VF boxes should be 4 synchro, but this box is most definitely 3 synchro, with the casing an identical match to my original TS stamped box. Anyone care to explain this? Either the books are wrong, or someone messed with the serial number?

3. The overdrive unit, as I have since discovered, is an original Standard Vanguard item, which means that it has the serial number 28 / 1327. This of course means that it is a 28% overdrive unit, rather than the TR standard 22% It is an A-Type overdrive, identical externally to the 3A overdrive which has serial number 22/1374. Is there any issue with using this higher ratio of overdrive? I think this will result in 3rd overdrive being lower revs than 4th, but I actually quite like the prospect of having the car geared slightly higher for more relaxed high speed cruising.

mg laycock overdrive serial number

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The Laycock manual lists a great number of vehicles to which overdrive was fitted, some being most unlikely candidates: Vauxhall Velox and Wyvern; and D type units to Ford 100E, Hillman Minx, Standard 10. 2ff7e9595c