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post #1 of 4 (permalink) Old 09-19-2011, 04:01 PM Thread Starter
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Differental Ring Gear size

I have a 2002 F 150 4X4 7700 series. It has the B6 axle code on the door (3.73 limited slip) differental. I'm trying to find out what the ring gear size is to order a new cover. The tag on the axle is to rusted to see the numbers
Anyone have an idea if its the 9.75 or 10.25 inch.

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post #2 of 4 (permalink) Old 09-19-2011, 08:34 PM
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It's probably something easy like count the bolts in the diff cover but I've been wrong before.

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post #3 of 4 (permalink) Old 09-20-2011, 04:26 PM
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My 05 had the 7 lug wheel option (which i assume you have being it's a 7700) and mine had the 10.25"..but mine also had the 4.10 gears which i thought were all that was available with the 10.25 in the heavy half...so i can't help much.The 9.75 has 12 bolts on the diff cover. You might have to pull up a pic of both and look which is similar to yours.

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post #4 of 4 (permalink) Old 09-26-2011, 11:12 AM
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I believe the 9.75/10.25 has the some cover. I was looking at a extra large cover and it the some number for both.

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