02-13-2010, 11:10 PM
I'm a terrible person
Join Date: Apr 2009
Total Cats: 178
I actually ended up getting a 1.8L carrier with a KAAZ lsd inside from a member on here. As for the RX7 differential it's fairly simple as it is an 88'. I would have followed this guide:
SOURCE: Miata Turbo FAQ: Differential
2. 86-88 RX7 assembly conversion:
86-88 RX7 NON-TURBO differential assembly
94-95 Miata stub shafts or RX7 stub shafts and 94-95 Miata half-shafts
or 96-05 Miata axles (no stubs needed)
RX7 Circlips (fit onto the end of the stubs/axles, miata clips will not fit)
94-05 Miata driveshaft
Miata Ring and Pinion
Miata Pinion housing (pumpkin) (find at RX7 performance shops)
Miata Diff. Bushings
Open the RX7 assembly. Decide what ring and pinon to use. Bolt the correct ring gear to the RX7 LSD. Swap the pinon gear and lsd guts to the miata pinon housing. Set the backlash (and pinon depth if swapping pinon gear), and assemble the miata pinon housing to the RX7 housing. Drill out the RX7 diff bushings and push in miata specfic bushings. Install as normal.
*note: The 84-85 LSD will fit, however, the housing is not compatible….unless you want to convert to a solid rear axle
*note: If converting to a RX7 Clutch LSD, simply avoid units from 84-85 models. While the LSD is technically the same, they come out of a solid rear, and there is no provision for the circlips on the stubshafts to lock into the unit, therefore you'll battle leaking axle seals, which isn't fun.
*note: The 89-91 Non-Turbo LSD will also fit, but shy away from these are they are Viscous LSD units and aren't worth the trouble.
*note: Replace the (2) seals on the Diff before reinstallation (MA02-27-238A $5.95)
*note: RX7 Circlips PN is (M005-27-421 $1.95)