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Originally Posted by Axl
I see - any aftermarket repair kits for this?
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First gear, and reverse is on the opposite side of the intermediate plate from second thru fifth, so they're not supported as well as the rest of the gears. Side-stepping the clutch in first gear all the time could crack or break the intermediate plate, which is where both shaft's second set of main support bearings' outer races are. The first set are pressed into the transmission case, ahead of the differential section.
The intermediate plate is the weak link here. The gearbox's design puts a lot of stress on the plate by not supporting first gear on both ends. Porsche's 915 gearbox addressed, and fixed this problem. Pelican Parts has a much beefier aluminum intermediate plate to replace the stock magnesium one in a 914/901 for $500 or so.