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Considering a swap to an M47. Do I need to consider the gear ratio of the rear end? 200

posted by  Jessie on  Sat Aug 14 16:30 CST 2010
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last visit: Tue Jan 18 17:45 CST 2011
[RELATED]

90s had 3.73 for autos and I think 3.31s for m47. I swapped my auto for an m46 on my 93. I would have swapped in a 3.31 if I could find one with an abs tone ring. I still have not found one.

But the 3.73 works fine with the gearbox. It turns about 2500rpm at 60mph. It works really well if you drive between 35-50mph because you can keep it in overdrive.

I am not sure what the effect on fuel economy is. I had an 89 with a m47 and 3.31 and I am pretty sure my 93 with the 3.73 actually gets better fuel economy. Both were better than the 93 when it had the auto.






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