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Old 02-10-2026, 08:19 PM
66 Le Mans Cruiser 66 Le Mans Cruiser is offline
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Join Date: Feb 2026
Location: Henderson, NV
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Quote:
Originally Posted by bdk1976 View Post
Depending on the current first gear in your 3 speed, switching to an m20 may not buy you much (if anything) off the line. What 3 speed are you currently running? What is the ratio of your rear axle?

Something like a super t-10 with a deeper first gear may be more appropriate for your situation, but need more info to make any real suggestions.
How do I find what transmission it is and what the rear end ratio?

I looked online as the car appears to be stock:

The 1966 Pontiac LeMans featured a standard 3-speed manual transmission, often a column-shifted Dearborn unit, with a heavy-duty floor-mounted 3-speed (frequently paired with the Hurst shifter option) available. These were "all-syncro" units with 1st gear ratios of 2.85:1 for I-6 engines or 2.42:1 for V-8 engines.

Gear Ratios (V-8): 1st: 2.42:1, 2nd: 1.61:1, 3rd: 1:1.

So car has 3 speed on floor with hurst shifter so I assume that is the correct ratio?