This information is intended to help everyone running a b-series transmission. The charts below list the top speed in each gear factoring in final drive and tire diameter. Obviously, there are other tire/wheel sizes here that I haven't listed however the sizes listed give you an idea when considering the small changes in overall diameter between slightly bigger wheel/tire combinations.
The below speeds/rpm drop down points assume an engine with an 8000 rpm redline.
94-01 GSR Transmission (S80)
15' 205-50-15 Tires
14' 195-60-14 Tires
13' 185-70-13 Tires
Tire Diameter = 23.1 Inches
4.4 Final Drive
GearShift RPMSpeed @ 8000 RPM (mph)
1stN/A 38.7
2nd470665.8
3rd572691.9
4th6082120.8
5th6089158.8
RPM in top gear at 70mph:3527
94-01...