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Differential Gear Ratios  Rating:  Rating
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 Posted: 12-01-2005 02:56 am
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TXJH
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Joined: 11-24-2005
Location: The Woodlands, Texas USA
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As a new owner of a 74 JH, just starting a extensive restoration, I wondered if anybody had any ideas on the merits of changing rearend gear ratios to make the car a better highway cruiser.  This seems a much cheaper way to decrease highway rpms, but at what cost to acceleration?

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 Posted: 12-01-2005 08:43 pm
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Judson Manning
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Joined: 03-14-2005
Location: Atlanta, Georgia USA
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Welcome to the fold....

There are only two choices for the rear-end ratio:  3.73:1 (4speed cars) & 3.45:1 (later 5speed cars). 

There are plenty of guys who have traded out their 5speed 3:45 REs for 3.73 REs for faster accelleration, however, I don't know of many who've gone the other way.

One thing to consider is the fairly tall 1st gear in the 4sp transmission.  The 907 has an absense of low-end torque which would make starting and stopping around town hard.

 

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