I acquired a Series 3 Land Rover about 12 years back. A few years ago I had differentials built for it in original 4.7 ratio gearing to replace the 3.54’s for what I find to be more favorable gearing considering the country hills around here. 3.54 is fine with flat landscape and coupled with my overdrive they were tall enough to make the freeway speeds easy.

These must both be front differentials, though they are interchangeable. A rear unit would have the filler hole. Neither of these have that.

One is stamped on the crown wheel and case. The other has no such stamp but has raised numbers and letters on the case.

On the case there are raised characters top and bottom. Top on both says

A22FH

Rover

HRC 1124

The bottom varies between the two. On the differential with the stamped case rim and crown wheel rim there are three difficult to decipher lines. Top one says *GF* Z then 87 then 420-12. The bottom case script on the other differential seems to me to read GF 922 then S then 5216