The Stovebolt Site Forums The Parking Lot Tons 'o Fun anyone change out their 5.17:1 diff gears?

My truck has the 4.10 gears. I don't really think they are hard to find; both my trucks actually already had them. If you post a wanted ad here you should be able to pick them up for $100-200 IME.

I drive my truck everywhere as my daily driver. (I've logged hundreds of miles on it just the last few days.) I run 32" tall tires on later 16" wheels, and it works pretty good for me. Here's what my speeds work out to (approximately):

45MPH=2,000RPM
50=2,200
55=2,425
60=2,650
65=2,875
70=3,075

Not too bad, IMO. (My truck is a later '65 with a 283/SM420 combo, btw.) Hope this helps.