Question about rim/rearend width

1

1sick65

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Jul 7, 2008

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#1

• Sep 2, 2008

• #1

Question about rim/rearend width (PICS)

I have a 65 mustang with a stock 8 inch rearend, i believe it is 57 and 1/4 inches wide... Now i have a set of rims that are 17x10 with a +20mm offset. I have already removed the inner wheel well so i will have no interference there. my question is will i have to narrow the rear for these tires to sit inside the quarters. thanks Nick

 

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ron67fb

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SF Bay area, CA

Sep 2, 2008

#2

• Sep 2, 2008

• #2

Wheel Offset Calculator

 

coolblue65

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Jul 26, 1999

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Algonquin, IL

Sep 2, 2008

#3

• Sep 2, 2008

• #3

Your problem will more then likely be the tire/wheel hitting the leaf spring. Below are a couple pics of me trying to stuff 275 drag radials under my '65 -these were on 15x8 rims with a 4.75" BS. Notice the tire itself is hitting the leaf spring and is sticking out past the fendor. A 17x10 is a big wheel, and I think the only way it will really work for you is if you flare your fendors or change your suspension.

 

1

1sick65

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Sep 2, 2008

#4

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• #4

ok heres what the inside of my car looks like... a little different then i think you were expecting

 

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ron67fb

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#5

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FYI 15" torque thrusts for early Mustangs use from +4mm to +6mm offset, so start with that. 14" used negative offset, about -2mm.

 

ultrastang

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Feb 26, 2002

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Arkansas

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#6

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I see by the photo, in link below, that your car's 8-inch rear has the old style weaker '62-'66 8-inch 3rd member, as evidenced by the lack of additional ribs you would find on the face of the '67-'80 model 8-inch 3rd members.

http://i51.photobucket.com/albums/f400/nicktomstew/untitled4.jpg

Having that much tire [surface area] in contact with the pavement with that 3rd member stands a good chance of tearing the driving pinion out of the case.

If you don't install an 9-inch, I would at least suggest installing the stronger C70W-style 8-inch 3rd member in the rear end you have.

 

1

1sick65

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Sep 3, 2008

#7

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thanks, i think i am just gonna order a custom width fab9 to ensure proper wheel fitment. I am still having trouble figuring out this backspacing concept any more help would be appreciated

 

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ron67fb

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Sep 3, 2008

#8

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• #8

1sick65 said:

I am still having trouble figuring out this backspacing concept any more help would be appreciated

Click to expand...

What part do you need help on?

 

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thekid760

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Sep 6, 2008

#9

• Sep 6, 2008

• #9

https://www.rsracing.com/tech-wheel.html