Since its introduction in 1961, the Achilles heel of the 4 speed synchro-mesh gearbox - as fitted to TR4/6, Dolomite Sprints and the Big Triumph saloons, was the laygear and layshaft. Failure of the bearing(s) causes destruction of the layshaft and the bore(s) of the laygear, the resulting debris often destroys many other expensive components. During the mid-1980s, with racing TRs in particular suffering repeated gearbox failures, due to the additional power being transmitted, many reconditioners modified laygears to take an extra bearing, which cured the fault, but they assumed there would always be a reclaimable laygear to salvage - not always the case! The solution is to produce laygears with the maximum bearing configuration in the first place, to extend the life of the gearbox almost indefinitely and, cope with just about any amount of power. Moss uprated laygears come with bearings pre-fitted, ready to install, with no modifications needed. For full details please contact your local Moss branch.
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