Gearbox Service

Complete BMW Airhead Gearbox Service for:

All 5 speeds from 1974 to 1995
Post 1969 4 speeds (Slash 5 Type)
Pre 1969 4 speeds (Slash 2 Type)

Each type has its own quirks and special needs. They all require their own special tools too. We can service them all right down to the last nut and bolt.

Obviously worn or broken parts get replaced as needed, heli-coils get installed when threads are found stripped, but in general a gearbox overhaul is as follows:

1974 - 1995 Five Speeds

This category is actually two distinctly different gearboxes, but in terms of service they are similar.

Total tear down and de-grease.
Full inspection.
New bearings.
New seals and gaskets.
New Neutral Switch
Shifter mechanism rebuild including new springs and roller (bearing type)
Shaft axial adjustment (shimming) to factory specification.

Optionally we can also provide vapor blasting of the gearbox case and install alternate first and fifth gear ratios. The circlip groove can be added (for output shaft forward bearing) as needed.

All teardown and assembly is done using proper BMW tools or better. Turn around is about 3 to 4 weeks...depending on what repairs are needed.

1969 - 1974 Four Speeds (Slash 5 type)

Total tear down and de-grease.
Full inspection.
New bearings.
New seals and gaskets.
Re-adjustment of overshift and undershift stops.
Re-adjustment of shifter side play.
Shift fork adjustment.
Shaft axial adjustment (shimming) to factory specification.

Optionally we can also provide vapor blasting of the gearbox case.

All teardown and assembly is done using proper BMW tools or better. Turn around is about 3 to 4 weeks...depending on what repairs are needed.