Rear End
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Joined: Oct 2005
Posts: 12,237
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From: Florida
Originally Posted by Monsta
Don't you wish you had one of these? 
My trained professional eye picked right up on this for you...
That would be a 5.10 rear you have there...5 butts, 10 cheeks...ALL saweeeeet!
joe.
Last edited by X_Hemi_Guy; Dec 9, 2007 at 04:08 PM.
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I agree, the first two are the best. But either any of them are good. Good post ken
hahaha
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
The axle is made by Sterling. It does have a tag but there are other ways to determine it without having to crawl under the truck. 
1. Door jamb label...some have the code, others don't. Compare the code.
31 = 3.73 Open C1 = 3.73 LS.
33 = 4.30 Open C3 = 4.30 LS.
Use the RPM method. Instructions are in the Super Duty FAQ stickied up top the Super Duty forum.
If it is a PSD equipped truck then it is 3.73 automatically.
1. Door jamb label...some have the code, others don't. Compare the code.
31 = 3.73 Open C1 = 3.73 LS.
33 = 4.30 Open C3 = 4.30 LS.
Use the RPM method. Instructions are in the Super Duty FAQ stickied up top the Super Duty forum.
If it is a PSD equipped truck then it is 3.73 automatically.