9" Gear ratio question.
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Freshman User
Joined: Apr 2004
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From: Camas,Wa.
9" Gear ratio question.
Hi, I have a '78 Ford E150 van. I was wondering how to tell what gear ratio is in the rear axle? Also I was wondering if this is for sure a 9" rearend?Thanks----Tom
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Joined: Nov 2004
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This is a way to get your ratio without counting the teeth. I personally used it and then had it checked at a rearend shop and it's dead-on. I learned it from this site, so here you go. It will greatly help to have two people when doing this.
You basicly are going to turn 1 rear tire 20 times and count how many times the driveshaft turned. Thats it! If the D/S turns 35 times you have a 3.5:1 ratio. Mine turned 24 full turns and almost 3/4 of another turn it was a 2.47:1 demon. My front Dana 44 had the stock 3.5:1 so it turned 35 times exactly.
You basicly are going to turn 1 rear tire 20 times and count how many times the driveshaft turned. Thats it! If the D/S turns 35 times you have a 3.5:1 ratio. Mine turned 24 full turns and almost 3/4 of another turn it was a 2.47:1 demon. My front Dana 44 had the stock 3.5:1 so it turned 35 times exactly.
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