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CCW offset help for solid axle car
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<blockquote data-quote="DCguy" data-source="post: 16947322" data-attributes="member: 196849"><p>I measured the rear end housing when I rebuilt it to make sure....its a 99-04. It has the 14mm lower control arm bolts as well.</p><p></p><p>I don't have the measurements on the IRS, but perhaps someone can add that here for context. I've always heard the 99-04 was closer to the IRS width than the 94-98 housing but your statement says otherwise.</p><p></p><p>These are per Ford manual:</p><p></p><p>Overall housing width:</p><p>94-98................56.094in to 56.198in</p><p>99-04................57.512in to 57.616in</p><p></p><p>Brake Flange Mounting Surface:</p><p>94-98...............54.10in</p><p>99-04...............55.51in</p><p></p><p>So there's about a 1.4in difference between the mounting flanges which equates to 0.7in wider per side.</p><p></p><p>In terms of wheel choice for the rears this means you'd have to run less backspacing and a lower positive offset (like a +10) for a 94-98 rear end vs. more backspacing and a higher positive offset (like +20) for a 99-04 rear to account for the increased track width.</p><p></p><p>Your business is wheels so you probably have more insight but my point is that folks should get the car on stands and determine their backspacing if they want to avoid the guess work. Everyone's setup will be different depending on suspension setup, tire choice, ride height, etc etc so a few min with a tape measurer is time well spent IMO.</p><p></p><p>I do also have C-clip eliminators without ABS rings and did have to shave my axles down a tad in order to get them properly seated so my measurements/setup is just a data point....not for everyone.</p></blockquote><p></p>
[QUOTE="DCguy, post: 16947322, member: 196849"] I measured the rear end housing when I rebuilt it to make sure....its a 99-04. It has the 14mm lower control arm bolts as well. I don't have the measurements on the IRS, but perhaps someone can add that here for context. I've always heard the 99-04 was closer to the IRS width than the 94-98 housing but your statement says otherwise. These are per Ford manual: Overall housing width: 94-98................56.094in to 56.198in 99-04................57.512in to 57.616in Brake Flange Mounting Surface: 94-98...............54.10in 99-04...............55.51in So there's about a 1.4in difference between the mounting flanges which equates to 0.7in wider per side. In terms of wheel choice for the rears this means you'd have to run less backspacing and a lower positive offset (like a +10) for a 94-98 rear end vs. more backspacing and a higher positive offset (like +20) for a 99-04 rear to account for the increased track width. Your business is wheels so you probably have more insight but my point is that folks should get the car on stands and determine their backspacing if they want to avoid the guess work. Everyone's setup will be different depending on suspension setup, tire choice, ride height, etc etc so a few min with a tape measurer is time well spent IMO. I do also have C-clip eliminators without ABS rings and did have to shave my axles down a tad in order to get them properly seated so my measurements/setup is just a data point....not for everyone. [/QUOTE]
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CCW offset help for solid axle car
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