Differential Question
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Junior User
Joined: Mar 2007
Posts: 59
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From: Texas
Differential Question
I have a 2001 v6 f150 & was wondering if it was possible to put on a harley davidson differential ranging 00-02 yrs. without having to make any modifications or if there is a big difference in differential settings...reason is harley already come with gears posi traction so i read & thats what i need! might come cheaper for me to buy diffential than upgrade mine with all the mods! ANY HELP would really aprreciate. THANKS IN ADVANCE<<<<
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
I'm guessing here a little bit. Your truck has a 8.8" rear axle and the Lightning will have a 9.75" axle. That difference alone to me says that the drive shaft flange is different. So with that in mind it will not be a direct swap. Someone else that knows for sure will chime in soon. Good luck! 
Postmaster
Joined: Nov 2006
Posts: 4,517
Likes: 3
From: SE Wyoming
That would be easiest if all you want is the posi and gears, I assume you have a 2wd so a regear and posi should run under $1K, the axle you want alone would run that then there is installation/fabrication. Any F150 with a 5.4L has the 9.75 rear BTW.
Posting Guru
Joined: Apr 2004
Posts: 1,921
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From: central TX
Stick with the 8.8 and put your own unit in (I'd do some gears will I was in there if that's an option). It's a fine rear end, especially for the V6.
The 9.75 is going to take a little more power to turn. Plenty other ways to get limited slip than going with a Harley/Lightning rear.
The 9.75 is going to take a little more power to turn. Plenty other ways to get limited slip than going with a Harley/Lightning rear.
