72 Blazer in need of advice

[DustinU]

Originally Posted by OLD K5

I think with 3:73 gears and overdrive will be perfect. Probably around 2200-2400 rpm on the freewayat 70mph.

Again, I don't have this setup but check out this link for approximates:

http://www.ringpinion.com/Calculators/Calc_RPM.aspx

The 700r4 is .7 in OD, with 3.73 and 33" tires at 70mph you would be turning 1861 RPM. If it is a newer trans or added lockup it should be fine I would think.
On the other had 4.56 gears with this setup would have much more get up and go and turning 2200-2300 rpm at 70 mph.
Just my thoughts, I am by no means an expert.