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3 different speedometers with 3 different ratios, which to use with my new tranny? 200 1980

posted by  drj434343 on  Sat Dec 11 12:31 CST 2004
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last visit: Thu Oct 24 09:46 CST 2013
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So I put in an M46 into my 80 245 a few years ago, and discovered that after the conversion my speedo read about 10% fast. I went through the whole issue of trying to find a different transmission speedo gear that would match the ratio of my differential, but haven't found one with the right teeth that would fit yet. Because I also don't want to replace the entire rear differential on my car, I had another idea.

I noticed my speedo has an R = .980 on the face. I'm assuming that is some sort of ratio that matches the transmission/differential combo in the car. Does that sound right? I came across two other speedos in the junkyard with R = 1.03 and R = .960. If I'm reading 10% fast with my current configuration, will either of these different ratios work? Should I move to the higher or lower number? Thanks!

Jason

1980 245 M46 145K






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New 3 different speedometers with 3 different ratios, which to use with my new tranny? [200][1980]
posted by  drj434343 subscriber  on Sat Dec 11 12:31 CST 2004 >


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