What we do on the 901 gearbox
Complete rebuild
stripping, measuring, reconditioning and setting up the ring and pinion with original factory tooling — finished with a test-bench run and photo documentation.Limited-slip differential
available for both case variants — aluminium and magnesium — with a locking value of 25 to 75 % to suit the use.Nardella stub axle
newly made, ground and heat-treated.Rotation-direction change
for conversions with relocated engine (mid instead of rear), including fresh setting of the hypoid drive.Housing restoration
glass-bead blasting with chemical after-treatment that restores the original, slightly mottled look of old magnesium cases.
Typical problems this solves
- Crunching gears and worn synchromesh after decades of use
- Worn bearing seats in the magnesium case
- No limited-slip differential available for historic racing
- Howling final drive from an incorrectly set contact pattern
Why inquire here
For early 911s the gearbox is often the last unsolved item of the restoration. We keep the whole chain in-house — from parts out of our own production to the set-up, test-bench-run gearbox.