What I’m looking to replace
These are the two types of plates used in the TT differentials locking plates and discs. If the plates now in the unit show a lot of wear I’ll do the swap. The angle of the pinion shaft and the matching slot in the TT housing seems to be about 45 degrees which means there should be three or four sets of plates and disks. If that is the case I will need to by one or two extra sets. The parts book only shows sets plus the concave inner plates.
The toothed disks are flat as are two of the plates. The third plate of each set are concave which keeps the disks and plates snug in the TT housing.
This is a new set of side gears They are for flanged axles and will replace the existing units in the TT assembly that are for tapered axles.
This is a 3.51:1 gear and pinion (used) that I intend to use. It ls slightly lower than the 3.73:1 that is presently in the car. It will give a slightly lower rpm for any given gear and that will reduce noise and improve mileage. The 289 R1 now in the Commander (say something around 220 HP) should handle the change with little difficulty.