Thread: 3 speed to 4 speed swap
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  #5  
Old 02-10-2026, 08:32 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 OG68 View Post
First gear ratio
Saginaw three speed is 2.54:1
Muncie M20 is 2.52:1

You're not going to see any improvement there.
Is there an alternate upgrade that would help?

Intake/carb?

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