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What a gearbox repair kit typically contains

Kit contents vary by application but typically include: input and output shaft oil seals, selector fork pivot seals, synchromesh rings for the most-used gears, needle-roller bearings, a gasket set, and sometimes shim packs for bearing pre-load adjustment.

Some kits focus on a specific failure area — for example a 5th-gear synchromesh kit for Volkswagen Group gearboxes notorious for 5th-gear crunch.

• Oil seals: shaft seals at both ends of the gearbox casing
• Synchromesh rings: brass or carbon-fibre composite friction rings
• Needle-roller bearings: replace worn layshaft and mainshaft bearings
• Gasket set: sump gasket and casing half gaskets
• Shim pack: for setting correct bearing end-float

When a repair kit is the right choice

A rebuild is justified when diagnosis points to worn synchromesh (gear crunch), oil seal failure (leaking), or bearing noise (whine at speed), but the gearbox casing and gear teeth are undamaged. If teeth are chipped or the casing is cracked, a replacement unit is more cost-effective.