going from 37 to 36 is a little less than 3%. there's about a 5% difference between 19 and 20. you probably can't hit it exact but being with in 1% is pretty good for the old speedos. if folks would do the math on this stuff a lot of guess work could be tossed out. the hard ones to do are the '65 and earlier were there are only 6 pinions to choose from and there's about a 5% spread between them all. The 35 tooth gear worked almost perfectly. It is one tenth off in 10 miles, so 1 mile extra in a 100 miles. Got the needle set at right about 1 MPH fast at 60 MPH. It's more accurate than my all factory stock '92 truck. Thanks again guys.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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