Gearing for the correct speedometer readings

[69 rt]

HI all,
I changed the  rearend in my 69 Charger R/T to a strange 60 with 373 gears. It came from the factory with 3.23 my problem is now when I am running at 55mph it shows 90 on the speedometer. Can I get a new gear to fix this, and where do you get them to correct this problem? Oh the wheels and tires are 14 inch as from the factory


Thanks

[mikepmcs]

here's a link with the speedo gear chart in it, scroll to halfway and you'll see it.  i'm guessing you will need the one with 41 teeth looking at these charts because they don't specifically id the 3.7's in there  someone else will chime in with more info i'm sure.

http://clubs.hemmings.com/clubsites/cowtownmopars/Specsheets.html

here's another link with a very trusted familiar name giving some advice and numbers(John Kunkel)

http://www.moparchat.com/forums/archive/index.php?t-72212.html

another chart

http://www.moparts.com/Tech/tech/pages/speedo.html

lastly, it looks like this place might be able to help  or at least point you in the right direction

http://www.transmissioncenter.net/speedometer_calibration_______va.htm

I would first try the local parts store or the dealer once you find which one you need.

v/r
Mike

[69 rt]

Thanks very much for the info. I can always count on the members for good advice.