'54 Ford Club of America - Forum

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 Post subject: 4.09 Rear End Gear Ratio
PostPosted: Sat Dec 05, 2009 9:41 pm 
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Joined: Sun May 10, 2009 12:23 am
Posts: 179
Location: California
I just pulled the "pumpkin" out of the rear end of my '54 Merc and counted the teeth on the ring and pinion to determine the gear ratio. The ring has 45 teeth and the pinion 11 teeth which works out to 4.09 which is a gear ratio that is fine for my car which has 3 speed overdrive. However the Mercury shop manual (pg.96) only shows a 4.10 ratio which is supposed to have 41 teeth on the ring gear and 10 teeth on the pinion. The '52 Ford shop manual (pg 230) shows that cars can come equipped with either 4.09 or 4.10 gears. This may explain the difference???? Anybody have any other ideas why my gears don't match up with the specs in the Merc book? Thanks


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