A poor mans alternative to the Torsen is a clutch type LSD from the '84-88 NA RX-7. While the 1990-93 Miata rear had a viscous LSD option, the 1994+ Miata's could have been ordered, based on package, with the superior Torsen type LSD. The smaller diameter and shorter Miata rear bushing vs the 86-91 RX-7 bushing You'll still need the short pinion cast iron front housing from the 94+ Miata (for the PPF mounting) and Miata specific rubber mounting bushings.ĭiff comparison, 1.6 6" ring diameter on left, 7" 1.8 on right If you can't find a 1994+ Miata rear in a salvage yard then try the rear aluminum housing from a '86-91 NA RX7, they are nearly the same. Swapping the later 94+ rear into a 1990-93 Miata is a bolt-in but requires replacing the entire diff housings assembly, driveshaft and half-shafts from the later 1994+ cars. The 94+ Miata uses the same length pinion as the 1st gen RX-7 (and B2000/2000 trucks/RWD626) and the front housing is unique to the Miata to allow a mount for the PPF. In 1994 Mazda used a larger and beefier rear unit for the 1.8 Miata that has a 7" ring gear and is derived from the 1986-1991 NA RX-7 rear with the exception of the shorter pinion and front pinion housing. It had a 6" ring gear and is not very strong. The 1990-93 1.6 liter Miata used a rear that was derived from the rear of the 88 323GTX AWD and dates back to the 1978 RWD GLC. Miata Drivetrain Interchange Guide Miata Drivetrain Interchange Guide
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