Filename: Mazda Transmission Ratios Pdf
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PBS MDR-1 Competition 5-Speed w/Changeable Ratios MAZDA TRANSMISSION RATIOS … NOTE 1: Gear set ratios listed “w/Transmission” indicate those ratios that come in complete …
Tailshaft Bearing Kit Transmission tailshaft bushings often seize due to the high rpm seen in competition. The only way to avoid these failures is to install a needle bearing in place of the bushing. Fitment of the needle bearing requires machining out the inside diameter of the tailshaft housing. The tailshaft bearing kit includes needle bearing, snap ring and information regarding the tailshaft machining. Use of a hardened competition driveshaft yoke (Part #4352-25-130) is required with this modification….. Reference Notes 1.Rib Case (Stock) Transmission (1974-78 – 12A & 13B) ? Main case has ribbing for strength and rigidity. ? The bottom of the transmission has an inspection plate. ? The bellhousing is separate/removable. ? This transmission can be used in 1979-80 RX7s with some external modifications. ? For racing purposes, potential weak areas are synchro rings and plastic shift control rod end bushing. The plastic bushing can be replaced by an aluminum bushing (Part #0000-02-9401). 2.Smooth Case (Stock) Transmission (1979-91 – RX7 Non-Turbo Models, Miata&626RWD) ? Main case is basically smooth, compared with rib-case design. ? The bellhousing cannot be removed from case. ? The location of the shift lever is further back on 1981-83 models. This transmission can be used on earlier models with modification of the shifter hole in tunnel. ? The breather “vent” is on the right side of the transmission on 1983-85 models. ? For racing purposes, the plastic shift control rod end bushing (on 1990-96 Miatas and 1979-80 RX7s) should be replaced with an aluminum bushing. ? 1979-82 626 gear ratios may be used as an alternative (call for information). ? 1979-80 transmission components are somewhat weaker and more likely to be damaged under racing conditions. Use 1981-85 gearbox. 3.Rib Case (Stock) Transmission (1987-95 – RX7 Turbo) ? Similar in design to early rib-case design transmission. ? The bellhousing diameter is larger than all other transmissions. ? The bolt pattern is identical to other transmissions. 4.”PBS” MDR-1 (Quick Change) 5-Speed Transmission (SeePBSTransmissionListing on T-7 for more information.).
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