Diff Ratios and Lockers.

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Originally Posted by isuzurover

Rover diffs: 3.54 and 4.7 ratios have a different flange position (i.e. most lockers are 3.54 type and need a spacer ring under the crownwheel to fit a 4.7 diff). Most aftermarket parts are made to fit the 3.54 centre.
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To complicate things, this is only true for genuine 4.7 R&Ps, which really nobody should use as they are pretty weak. Aftermarket R&Ps are usually designed with the same flange location as the 3.54.

101s have 5.57:1 diff ratios and do have a larger axle - I cannot remember id you use the old axle gears or not.

Garry