Andy,
with 185/70/13's the following will be the RPM/speed:
3.07:1
60mph: 2669 rpm
70mph: 3114 rpm
3.31:1
60mph: 2878 rpm
70mph: 3357 rpm
For what it's worth. if you are prepared to pull the rear end... dont...
you are better off switching to the wide ratio trans gears.. you will get a
shorter first and quicker take off without hurting cruising rpm. I have a
3.07 and run 195/60/14 ... the wide ratio gives a better first than i have
even with shorter gears,, and better highway.
The 5 speed is the best option.. you could run a slightly shorter rear..
have brutal acceleration.. and still better than stock highway... then
again.. traction might be harder to come by off the line...
i would switch out your first gear ratio before you swap the rear end. just
my .02
--
Regards
Michael King
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