32703 Speedometer Pinion - Index of Part Numbers for 280ZX (S130) (1, 2, 3) ------------------------------------------------------------------------------------------------------------------------------------------------------------------ Nissan Part Number Teeth Count Gear Color Lookup Code Teeth Count to Differential Ratio ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-78100 16T YELLOW 32703 16t 3.363 37/11 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-78101 17T BLACK 32703 17t 3.545 39/11 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-78102 18T BLUE 32703 18t 3.700 37/10 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-78103 19T WHITE 32703 19t 3.900 39/10 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-78104 20T RED 32703 20t 4.111 37/9 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-86401 21T PURPLE 32703 21t 4.333 39/9 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-86402 22T ORANGE 32703 22t 4.625 37/8 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 32703-86403 23T GREEN 32703 23t 4.875 39/8 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 1) https://www.nissanpartsdeal.com/parts-list/1979-nissan-280zx/power_train/manual_transmission_transaxle_fitting.html?PNC=32703 (The Source of the Above) 2) https://parts.nissanoflumberton.com/p/89627570/32703-78102.html (The Source of the Above) 3) https://zparts.com/?s=speedo (The Source of the Above) 4) https://www.nissanpartsdeal.com/parts/nissan-pinion-speedo~32703-78100.html (Additional Information) 5) https://www.nissanpartsdeal.com/parts/nissan-pinion-speedo~32703-78101.html (Additional Information) 6) https://www.nissanpartsdeal.com/parts/nissan-pinion-speedo~32703-78102.html (Additional Information) 7) https://www.nissanpartsdeal.com/parts/nissan-pinion-speedo~32703-78102.html (Additional Information) 8) https://www.nissanpartsdeal.com/parts/nissan-assy-pinion-19t~32703-78103.html (Additional Information) 9) https://datsunzgarage.us/engine/ (Pictures) 10) https://www.zdriver.com/forums/240z-280zxt-s30-s130-tech-tips-275/performance-modification-tips-20075/ ___________________________________________________________________________________________________________________________________________________________________ Keeping the Speedometer Correct (10) The speedometer is metered by a plastic, toothed cog on the end of the speedometer cable that screws into the transmission. This cog is paired with the differential, not the trans. So it doesn't matter which trans you have, all you do is select the proper cog for the rear-end ratio you have in the car. While they are colored for easy identification, the Nissan dealer only has them in their part list as "17, 18, 19, 20, or 21" tooth cogs. Here's how to figure out which is which: YELLOW is the 16 tooth for the 3.36 BLACK is the 17 tooth for the 3.54 BLUE is the 18 tooth for the 3.70 WHITE is the 19 tooth for the 3.90 RED is the 20 tooth for the 4.11 PURPLE is the 21 tooth for the 4.38 Datsun R-200 list (not R180) '75-79 280Z(X)s had a 3.54 '81-83 turbo ZX's had a 3.54 '81-83 non-turbo ZX's had a 3.90 '85-86 200SX turbo had a 4.11 '87-89 LSD was a 3.70 TO DETERMINE THE RATIO (internally) If you're not sure which ratio R200 you have lying around the garage, check it this way: Remove the rear plate (drain the oil of course). Then rotate the large ring gear until you see some numbers stamped into the edge facing you. If it's a 3.54 it will read "39:11" If it's a 3.70 it will read "37:10" If it's a 3.90 it will read "39:10" If it's a 4.11 it will read "37:9" ___________________________________________________________________________________________________________________________________________________________________