Mick: I run 3.73 and a TKO-600 with .82 od. My engine combo doesn't like cruising below 2200 rpm. The .64 is much better if you can drive at 80 mph on the freeways. Here our speeds are limited to 60 to 70 mph.
I can cruise at 65 to 70 mph no problem. my rear tire is 28" tall. I believe I cruise at 2500 at 70 mph
Let us know how the rear gear and od work out for you once installed.
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