The Mazda 4.30 ratio ring and pinion set is suitable use on the following rotary application: 1987-1991 TURBO II RX-7.
Alternate axle ratios are available for special applications. These ratios interchange exactly with the stock parts and should be adjusted to stock specifications (except as noted on the information sheet supplied with the gear set). If you replace your existing gear set with a lower ratio (higher number) gear set you will increase the vehicle's acceleration and move through the transmission gears quicker, but you will simultaneously reduce the top speed of the vehicle for a given rpm limit. However, if you reduce your existing gear set with a higher ratio (lower number) gear set you will decrease the vehicle's acceleration and move slower through the gears, but the top speed of the vehicle will increase for the same given rpm limit as in the previous example.
THIS PART CANNOT BE RETURNED FOR EXCHANGE OR REFUND DUE TO ITS FRAGILE NATURE AND POSSIBLE CUSTOMER MISHANDLING