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Old 07-01-2003, 00:52   #1 (permalink)
freddo
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XF Fairmont diff specifications

I need two know thw following info for a XF Fairmont 6 cylinder diff

1) 25 or 28 spline axles?
2) what size 8" or 8 3/4?
3) can I fit 3.7:1 gears?
4) will the LSD need to be replaced to suit the different ratio (I have been lead to beleive there are 2 different LSD's)
5) How strong are they?
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Old 07-01-2003, 02:30   #2 (permalink)
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Re: XF Fairmont diff specifications

Quote:
Originally Posted by freddo
I need two know thw following info for a XF Fairmont 6 cylinder diff

1) 25 or 28 spline axles?
Should be 25, but you can't be sure without checking.

Quote:
2) what size 8" or 8 3/4?
Ford have never used an 8" BW, they are 7 1/2" or 7 3/4", yours is 7 1/2".

Quote:
3) can I fit 3.7:1 gears?
Yes.

Quote:
4) will the LSD need to be replaced to suit the different ratio (I have been lead to beleive there are 2 different LSD's)
If you have 2.77, you will need to change hemisphere.

Quote:
5) How strong are they?
Depends on the answer to 1).
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