OneStopRestoration's Special Orange 69 Chevelle 300 Deluxe Coupe

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**Bill Pritchard** · #1 07-31-2023, 10:13 PM

3.31 rear axle ratio was standard with the 3 speed manual, whereas 4 speed equipped cars got a 3.55, so there's a good chance this was an original 3 speed car. I too will be following along as you progress!

**Too Many Projects** · #2 08-02-2023, 02:57 AM

Quote:

Originally Posted by Bill Pritchard

3.31 rear axle ratio was standard with the 3 speed manual, whereas 4 speed equipped cars got a 3.55, so there's a good chance this was an original 3 speed car. I too will be following along as you progress!

Would that have held for 1970 also ? I've had 4 '70 SS 4 speed cars and 3 of them had 3.31 ratio. The 4th was a 3.73. Of all the 12 bolts I've had over the years, I've never had a Chev 12 bolt with 3.55 gears, but all the 3.31's were M20's also. Maybe the M21 came with 3.55 ?

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