[gmc1963]

Originally Posted by bdshumaker

OK, thanks.
Doing some calculations with my 28" diameter tires, I get

3.54 @ 2000rpm=47mph
3.54 @ 3000rpm=70 mph
3.54 @ 4000 rpm=94 mph

If I change to the 3.07 I get:

3.07 @ 2000 rpm=54.3 mph
3.07 @ 3000 rpm=81.4 mph
3.07 @ 4000 rpm=108.5 mph

I'm thinking I really shouldn't run the 283 at 3000 rpm to run at highway speeds of 60-70mph so I might go with the 3.07. What do you guys think?

Brian

to fast