My '64 truck (lightly tuned 230cu, with stock 3-speed and back end) revs pretty high at freeway speeds and drinks more fuel than I'd like (at $7 per gallon English prices!)
Assuming its the stock 3.73 ratio I would see a useful drop in revs moving to a 3.07, which I believe was a factory option. American car spares are rare over here, so are there any other GM cars or trucks which used the same axle I could look out for a third member to swap? Even in the USA is the 3.07 differential an easy part to find?
Thanks for the advice, Limey
