G'day

First up. Datsun L series 5 spd gearboxs...is there any way to id them to know if they are from say a 240k, 280z, bluebird etc.?

Second. My maths may be a bit rusty but i think i worked out that with my gear box in 4th gear (1:1 ratio) mated to diff (4.111:1) with 16/45/205 tyres wokrs to roughly 50mph (80km/hr) at 3200 engine rpm...sound about correct? Tryin to figure out if my speedo is going to be out on a 1600..

thats the pointless info i'm chasing now.
Wyman.

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71 510.....rebuilding l20b :>(