How to determine gear ratio?? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 05-29-2013, 10:21 AM Thread Starter
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How to determine gear ratio??

What is the best way to find out my gear ratio 96 f-250?
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post #2 of 6 Old 05-29-2013, 10:22 AM
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Look for the axle code on the door tag

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post #3 of 6 Old 05-29-2013, 11:34 AM
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If it is still stock Kris

Lift one rear tire and using chalk draw a line straight down from the tire to the ground. Next draw a line from the u-joint in front of the pinion shaft to pinion neck of the pumpkin housing in the axle housing. So at this point the line on the tire and the line on the d-shaft all line up to their reference lines on the ground and pumpkin. Put the tranny in neutral and spin the tire one full rotation while you count how many times the d-shaft line crosses the pumpkin line. 3.5 times you have a 3.55, 3 3/4 times your have a 3.73, just over 4 times and you have a 4.10 (and so on). If the one tire does not want to spin than you also have a limited slip in the rear and will have to lift both rear tires off the ground to continue.

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post #4 of 6 Old 05-29-2013, 11:44 AM
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If you do it with just one tire(open diff) ya gotta divide by two. The driveshaft will spin 8 1/4ish times to be a 4.11. If it's a posi/limited slip, then both tires one rev and count the driveshaft without the dividing.

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post #5 of 6 Old 06-03-2013, 05:16 PM Thread Starter
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okay thanks. I knew it was't stock they said it was different but didn't know what they were
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post #6 of 6 Old 06-03-2013, 05:37 PM
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Unless your clutches are worn out then it will still spin when you have limited slip.

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