Transmission differentiation - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Agamemnon · 07-12-2014, 01:04 AM

The difference is that the one came with a 20 tooth pinion, and the "Sport pack" came with a 21 tooth pinion. The 21 tooth pinion was used to correct the speedometer due to changes in the diff gearing for faster acceleration. What diff are you using? If you have a lower geared diff or swapped in a JDM 180sx diff(4.36 ratio), then use the 12T pinion.

Really all you get is a 2-4mph difference in the speedo.

07-12-2014, 01:04 AM	#4
Agamemnon Post Whore! Join Date: Sep 2003 Location: Lake Stevens, WA Age: 42 Posts: 2,667 Trader Rating: (20) Feedback Score: 20 reviews	The difference is that the one came with a 20 tooth pinion, and the "Sport pack" came with a 21 tooth pinion. The 21 tooth pinion was used to correct the speedometer due to changes in the diff gearing for faster acceleration. What diff are you using? If you have a lower geared diff or swapped in a JDM 180sx diff(4.36 ratio), then use the 12T pinion. Really all you get is a 2-4mph difference in the speedo.