Since March, 2007 production, BMW has fitted rear axles where the ring gear is welded to the differential carrier.
Our Install Kits, combined with precision machinework, allow fitment of a Wavetrac® differential in late-model BMW rear axles where the ring gear is factory welded to the standard differential.
Upon receipt of a customer’s differential/ring gear assembly, the ring gear is separated from the stock carrier using CNC equipment. The ring gear is then machined, drilled and threaded to allow bolt mounting to a new Wavetrac® differential.
We then return to the customer:
• Wavetrac® Differential
• Customer’s machined ring gear
• Precision-ground spacer ring (where required)
• Set (10) of custom, high strength ARP® ring gear bolts
For the best possible performance, disassembly of the stock axle, and fitment of the Wavetrac and Install Kit should be performed by one of our Specialist Dealers. This ensures that the condition of the axle can be assessed before modifications are performed, and that the re-assembly is done professionally - ensuring correct gear backlash and bearing end play.
BMW |
Wavetrac |
Install Kit |
E9X 335i MT up to 3/2007 |
30.309.170WK* |
not required |
E9X 335i AT up to 3/2007 |
30.309.170WK* |
not required |
E9X 335i MT from 3/2007 |
30.309.155WK |
30.309.371WK |
E9X 335i AT 3/2007- 9/2007 |
30.309.155WK |
30.309.371WK |
E9X 335D r=2.81 |
30.309.173WK |
30.309.174WK |
E9X 335iS DCT 2009> |
30.309.173WK |
30.309.186WK |
E8X 135i MT 3/2007> |
30.309.155WK |
30.309.371WK |
E8X 135i DCT |
30.309.173WK |
30.309.187WK |
F01/F02 ALPINA B7 |
30.309.155WK |
30.309.378WK |
E63 650i 2009-11 |
30.309.155WK |
30.309.379WK |
F01/F02 750i 2009-11 |
30.309.155WK |
30.309.381WK |
F01 750i r=3.46 |
30.309.155WK |
30.309.382WK |
F12 550i MT r=3.08 |
30.309.155WK |
30.309.383WK |
F30 335i MT r=3.23 |
30.309.155WK |
30.309.384WK |
E9X 335i DCT r=2.56 |
30.309.173WK |
30.309.186WK |
E8X 135i DCT r=2.56 |
30.309.173WK |
30.309.187WK |
F22 M235i r=3.08 |
30.309.155WK |
30.309.392WK |
E9X 335i AT from 9/2007 > |
30.309.175WK* |
not required |
E8X 135i AT |
30.309.175WK* |
not required |
F3X 328i/428i |
30.309.175WK |
30.309.185WK |
F3X 335i/435i AT |
30.309.175WK |
30.309.188WK |
* indicates bolted OEM ring gear. No machining or Install Kit required.
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