4th gear with stock gears at 7000 RPM 146 MPH 4th gear with 4.10 gears at 7000 RPM is 132 MPH4th gear with stock gears at 7500 RPM 157 MPH 4th gear with 4.10 gears at 7500 RPM is 141 MPH 4th gear with stock gears at 8000 RPM 168 MPH 4th gear with 4.10 gears at 8000 RPM is 151 MPH MPH = [TIRE DIAMETER x RPM] / [GEAR RATIO x 336] RPM = [GEAR RATIO x MPH x 336] / [TIRE DIAMETER] Gear ratio in these formulas represents the gear ratio in your chosen gear, times the differential gear ratios. Tire diameter on most drag race tires(ie. BFG drag radials or MT ET streets) are approximately 26".
Stock gear ratios for Z32 transmission: Auto Manual 1st 2.784 3.214 2nd 1.544 1.925 3rd 1:1 1.302 4th 0.694 1:1 5th n/a 0.752
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