Does this include the differential or final drive?

No, this is the gear box assembly only; the differential is a separate component.

What is the gear ratio for the 5th gear in this set?

The ratios are standard OEM spec for 3 Series, designed for fuel economy and acceleration.

Are the bearings and seals included in this assembly?

Yes, all necessary bearings, thrust washers, and seals are included for a complete rebuild.

Will this gear set reduce transmission whine?

Yes, precision helical cutting of the gears ensures quiet and smooth operation compared to straight-cut gears.

Is this assembly compatible with a limited-slip differential?

Yes, the output shafts are splined to accept both open and factory limited-slip differentials.

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Part

Gear Box Assembly

Compatible with BMW 3 Series

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Product Description

Rebuild your transmission with this complete gear box assembly for 3 Series. It contains all internal gears, shafts, and synchronizers for a full overhaul. Engineered to handle the factory power output of 3 Series with minimal noise. Restore smooth shifting and reliable operation to your 3 Series with this comprehensive gear box assembly.

Key Features

Includes all main shafts and counter gears
High-strength alloy steel construction
Shot-peened gear teeth for fatigue resistance
Replacement synchronizer rings and hubs
Factory-spec gear ratios for optimal performance

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