Hi I have a 1966 Pontiac Catalina and i was told i had freeway gears in the rear
end meaning top in was great but slow from the start . What kind or size of
gears should i look into to get a little more from the start
First identify the gear ratio you have now. Look for a tag on the rear diff.
Most common back then were 2.73. you need to do some research on the differentials and just how much lower gears you want to go. Here's a site that might give you a start: http://garage.grumpysperformance.com/index.php? threads/differential-in-catalina.11481/
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