Part #: 650-373
New OEM genuine Nissan transmission speedometer pinion gear assembly for manual transmission. Choose from 17 tooth (Black), 18 tooth (Blue), 19 tooth (White), 20 tooth (Red). All components (gear, seals, pin) of the assembly will interchange with each other and with your original. Choose from early or late style.
We have found that if your speedometer is reading to fast then switch to a higher numerical pinion gear will slow the speedometer down.
*Please read.... The details:
Nissan made 2 different styles of pinion gears that at first appear to be identical, but upon closer inspection are different. The gear and shaft are offset (not centered) in the housing, so that the assembly can only go in one way to make contact with the internal gear to function. The assembly can be rotated to fit, but then the tab/keeper that holds it in place will not line up with the notch in the housing. It seems that early cars (all S30) used the style with the retainer tab above the pinion gear, and later (mostly 280ZX) place the retainer tab under the pinion gear (see pic).
If you have an S30 your options are: