Have we determined the differences in the speedo/odo cluster that compensate for various rear end ratios. I remember on 70s era Datsun Z cars that there was a mechanism all speedo drive gear for each rear end. All that was necessary was to have the gear that matched the differential ratio. The drive gear was in the transmission accessible with the trans installed.

The speedometer in my 85SD reads low when installed in my 84. The 84SD's speedo re ads lower still. I think the speedometer is entirely electric while the odometer is mechanical. I don't know where the pickup is located.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.