Originally Posted by
geezer101
IDK if it's referred to as a 'heat sink' but I am aware that there are reinforced gearbox sump/cover plates for the manual transmissions as OEM fitted. When the gearboxes experience a lot of torque through them (seems to be exaggerated in 5th gear), the gearbox casings flex enough to cause the gear sets not to mesh completely, resulting in the gear teeth profiles only making contact to the outer faces of the sprockets. Do it enough times - bang, blown gears. Tuffpans are 19mm thick billet alloy sumps that use studs and flange nuts instead of bolts (apparently there are 12mm thick ones as well - don't know how much difference in performance it would be though...). They aren't particularly exotic in their design and if you could get your hands on some billet and give it to a (competent) machine shop, they'd be able to make a reasonable copy of one.
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