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Speedometer Correction
http://www.bgsoflex.com/auto.html
Check out this link, you'll like the other auto-math calculators too. TX is right, you have to count the drive gear teeth. You may be abe to see it with a inspection mirror, if not you'll have to pull the tail housing. What was your original rear gear? Looks like you can calculate drive gear on this site as long as you know driven gear size and orig. gear ratio.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
Last edited by Sweet72; 09-06-2004 at 08:01 PM.
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