Quote:
Originally Posted by Junkman
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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The pickup is in the transmission. All mb trans have the same ratio in the trans, but the speedo is matched to the differential ratio.
Non turbo automatic or stick 240's use 3.69 rear ratio.
All non turbo automatic 300's use 3.46 ratio
All turbo diesel cars up to 84 use 3.07 ratio
The 85 turbodiesel cars use a 2.88 ratio