Changing diff ratio

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For what it's worth. Below is a formula to use that might save you $$$$ To get M.P.H. divide K.P.H. by 1.6 example (96KPH=60MPH) At 60 MPH, x Axle ratio x 336/Tyre Diameter = R.P.M.@60 M.P.H THEREFORE 60 X 2.18 X 336 / 24 = 1831 R.P.M. RATIO: Equals tail shaft turns, to one revolution of wheel. DIAMETER = Measure tyre height from top to ground with tape.

......................T Y R E..........D I A M E T E R DIFF ....24"...26"...28"...30"...32"...34"...36"...38"...40"...42"... RATIO 2.18 : 1831 1690 1570 1465 1373 1293 1221 1157 1099 1046

2.50 : 2100 1938 1800 1680 1575 1482 1400 1326 1269 1200

2.74 : 2301 2124 1973 1841 1726 1625 1534 1454 1381 1351

3.08 : 2326 2388 2218 2070 1940 1826 1725 1634 1552 1478

3.23 : 2713 2504 2326 2170 2035 1951 1809 1714 1628 1550

3.50 : 2940 2714 2520 2350 2205 2075 1960 1857 1764 1680

3.73 : 3133 2892 2686 2507 2349 2212 2089 1979 1880 1790

3.90 : 3276 3024 2808 2621 2457 2312 2184 2069 1966 1872

4.10 : 3444 3179 2952 2755 2583 2431 2296 2175 2068 1698

4.56 : 3830 3536 3283 3064 2873 2704 2554 2419 2298 2189

4.88 : 4099 3784 3513 3279 3074 2894 2733 2589 2460 2342

Might be something for all to use & maybe someone can put it in The Holdenpedia, as I don’t know how. It will give you a guide as to what your Revs will be Knowing Diff Ratio & Tyre Size, are at a given speed, without taking your vehicle for a run & no tachometer required. Well that’s another two cents worth. Hope it helps, Cheers Jacks.