Differentials.

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Diff Ratios.

From:      WILLIAM  L. LEACOCK, 75473,3572
DATE:      7/4/95 9:10 AM

    model               ratio    crownwheel    pinion
Std landrover           4.7:1    47            10
Rover 90   &            4.3      43            10
P5 manual
P5 auto                 3.9      39            10
Range rover,            3.54     46            13
90,110, &
P5 Mk3 auto
LR 80, 1948/9           4.88     ?             ?

There are a couple of companies offering their own brand of high ratio differentials with ratios higher than the 3.5. [LA: see axles and diffs] (Calculation is simply number of crown wheel teeth divided by the number of pinion teeth.)
- Regards Bill Leacock. Limey in exile