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Does anyone know what is the correct Idler gear for a 333 and 1128 box? When I took my 333 box apart the idler gear shaft is slightly shorter on the side that goes into the gearbox housing where as the 1128 idler gear has the same length shaft either side? I've subsequently been told that this is wrong and that the shorter idler gear should go in the 1128 box and the equal length idler gear is for the 333 box?

The 333 (3 synchro box) would have had an Idler Gear with the shafts the same length, the 1128 (4 synchro box) went over to the long / short shaft.

The "long peg" idler gear was introduced into production on the Cooper S shortly after Timo Makinen lost the 1966 RAC Rally due to failure of the (inner) bearing on the "short peg" gear. That would have been 3 syncro box?

LMM76C wrote:The "long peg" idler gear was introduced into production on the Cooper S shortly after Timo Makinen lost the 1966 RAC Rally due to failure of the (inner) bearing on the "short peg" gear. That would have been 3 syncro box?

There was a brief overlap in production and as I sit here, I can't recall which way that overlap went, but it there weren't very many.

Somewhere else on this forum, I did detail it.

Look at the casing. It's quite obvious.