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Gear Ratio B3

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Old Dec 26, 2008 | 02:14 PM
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bigralso
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Gear Ratio B3

Looking through the forum and found axle code B6 3.73 ratio. I was told that my 2001 XL 7700 4X4 was 3.73 but my axle code is B3 What ratio is B3. What size would the diff be 9 or 10 inch??
 
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Old Dec 26, 2008 | 06:36 PM
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It's a 3.54 L/S unit. I beleive that the ring gear size is 10.75. It's actually the light duty 3/4 ton axle.
 
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Old Dec 26, 2008 | 11:36 PM
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It should be a 10.25" rearend. Never seen a B3. L9 is 3.55 Maybe it is 4.10?

Look on the axle tag. It will have something like 4L 10 or 3L 73.

Whatever it is, it should be a traction-lok.
 
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Old Dec 27, 2008 | 02:21 PM
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Now that it is day time and just moved over a foot of snow, so I can get to the door ,
I must have been dislyxic, because it is a B6 axle and with a 10.25 housing.
Laying in the snow to get to rearend was a little cool this morning. at least it has warmed up to -6C
from -26C.Thx for the replys.
 
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Old Dec 27, 2008 | 06:04 PM
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sounds about right. 3.73 LS.
 
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