Rebuilding involves also renewing the friction linings in the tranny, cleaning the gears and bringing all the tolerances and clearances back within spec as well as resealing the clutch packs and internals. Also, any upgrades are usually applied to rebuilt trannies.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record