07-09-2020, 01:16 PM
It can't have a low ratio top gear because top is always 1:1 as it's straight through the box. It's possible that you've got a 5.625 diff/pinion set-up, perhaps for a van/sports (8/45). With a lightweight special you should be able to get away with the 4.9 diff from the earlier cars (9/44). The LWB axles are usually 5.25 (8/42).