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The Moss gearbox was used in Jaguar cars up through the
1964 model year generally and the Mark 2 for another year or two. While the
design of the gearbox did not change, the gears were made in three different
machining processes during those years and they do not replace each other by
simply counting the teeth. Mismatched gears that were not made by the same
machining process will nearly always make noise when rotated under load.
When the synchros on second, third and
fourth gears become worn, they will not shift properly anymore, even if you
know the proper shifting technique. Resorting to slow shifting, crash
shifting or double clutching are only temporary tactics to get the car to a
point where you can remove the transmission from the car and rebuild it.
We developed a process about twenty years
ago where we re-machine the synchros and make them work better than they
ever did. We carefully examine all the internal parts and repair or replace
those that are no longer serviceable. If low gear is noisy, new mainshaft
bearings in many cases will cause
low gear to be quieter. In addition we also go through the shifter and top
cover of the transmission to ensure the proper function of the detents and
shift rails. Sometimes the nose of the mainshaft is worn out. In that case, we sleeve the front of the
shaft to give it new life.
These are very robust transmissions and in
most cases have been abused for 20 of their 40-50 years. Rebuilding the
transmission and getting it to shift correctly again should add another
30-50 years to its life. Please click
here to see current rebuild base prices.
Rebuild Packing List
Print out a worksheet to send in with your part to be rebuilt.
