3.70 rear end gear change - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-27-2002, 08:17 PM
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Post 3.70 rear end gear change

My trans. is a 400 THM and has a rear end gear ratio 3.08 and i would like to go to 3.70.--The 3.08 has a 37 tooth ring gear and a 12 tooth pinion gear.--The 3.70 has a 37 tooth ring gear and a 10 tooth pinion gear.---Can i leave the 37 tooth ring gear in and just change the 12 tooth pinion gear to a 10 tooth pinion gear??????????

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Old 12-27-2002, 10:52 PM
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No, because when you compare ring gears, you'll notice that the 3.08 ring gear is thinner (from carrier flange to teeth). The pitch is gonna' be the same, and that's because they are the same diameter (ring gear).
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Old 12-28-2002, 08:11 AM
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Ring and pinion gears come in sets. They must be installed in sets or breakage and/or noise will result. If you had a 3.70 (37/10) in your rear end and a 3.70 (37/10) in the box...... you should NOT change just the 10 or just the 37.

MATCHED SETS only.


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Old 12-28-2002, 09:25 PM
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Thanks guys for the info.
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