> At 60 mph my tack registers right at 3500 rpm.
Could be the tach is wrong. Should be closer to 2900 rpm (with 205/70-15
tires & 3.7 gears), and reading 600 rpm high isn't terribly uncommon for
these old mechanical tachs.
> Short of removing and
> disassembling the rear end is there any way to tell what
> rear-end gears are
> really in the car.
Lots of ways. If you jack up one rear wheel (leaving the other touching the
ground or otherwise blocked from turning), you can put a mark on the wheel
and on the driveshaft and count how many turns the driveshaft makes for 2
full turns of the wheel. The driveshaft will turn less than 4 full turns if
you have the standard 3.7 gears; more than 4 full turns if you have 4.1 or
4.55 gears.
To get a more accurate value, turn the wheel 20 full turns, giving 37 turns
of the driveshaft for a 3.7, or 41 or 45.5 for the other ratios.
Randall
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