and swapping the 4.56 for a 4.10 won't solve that problem, only cuts your RPM by 10% at most, lots of work and expense for no gain.
Bill
It would be worth it to me, Bill. If he only wants to run 55-60 the 4.10 swap should get him there. With 30" tire height 55 mph is about 2500 rpm. vs. 2800 plus rpm at 55 with the stock 4.57. Once you find the elusive 4.10 chunk, it's an afternoon of work to swap it.
