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Why does the M46 feel so different from the M47? 200

I just replaced my m47 with an m46 (bad bearing in m47), and my car seems to feel toatally different. The shift indicator points are way out of wack now, and the engine seems to be running at a lower rpm at a given speed. From the specs I have the gear ratios are the same for M46 and M47 except for 5th vs overdrive. In overdrive it is only turning just over 2000 rpm at 100km/h (60mp/h). That seems really low. I am pretty sure my 84 turbo (away for the winter so I can't check) was turning about 2450 at 100 in OD last time I drove it, and you could shift into OD at 70 without lugging. The OD on my 89 lugs below 90.
Am I missing something? I thought the rear ends were the same between all standard sedans. Were all m46s the same?






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