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Wheel backspacing with 3rd gen 9"

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Old Jul 8, 2014 | 08:30 PM
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Default Wheel backspacing with 3rd gen 9"
I have a 99 trans am that I swaped a 9" that came out of a 3rd gen camaro and I want to run 15x10 rear rims.... the rims I'm looking at have a 5.5" backspace... I know on 3rd gens 5.5 backspace is a common 15x10 choice... Since I am running the 3rd gen axle which is 3" narrower from what I've read would I have any trouble running a 28x10.5 tire with that rim????

On paper it looks to me like the tire would stick out .5" on each side more than if I was running a 4th gen axle with a 7.5 backspace 15x10 is that going to cause problems????...
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Old Jul 9, 2014 | 09:43 AM
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My understanding is that third gen rears are 1-1.5" narrower than fourth gen. So I think you're right that 5.5" bs may stick out more than you would like.
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Old Jul 9, 2014 | 10:51 AM
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Originally Posted by TORK?
My understanding is that third gen rears are 1-1.5" narrower than fourth gen. So I think you're right that 5.5" bs may stick out more than you would like.
1-1.5" per side?.... Maybe I'm wrong but Ive read that a stock rear is 64.74" and a 3rd gen is 62" hub to hub...

I am worried about the tire rubbing the fender lip when I hit bumps or launch it at the track with that size tire... idk how much room there is for error before I have to start rolling and modifying the fender...
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Old Jul 9, 2014 | 10:56 AM
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Sorry yes 1-1.5" per side for a total of 2-3" difference.
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Old Jul 9, 2014 | 11:13 AM
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Originally Posted by TORK?
Sorry yes 1-1.5" per side for a total of 2-3" difference.
Do you think i can get away with that extra 0-.5" on each side?
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Old Jul 9, 2014 | 11:19 AM
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Stock 4th gen rear is 64.75 w/o the rotors.

It will work with the backspace, you may need a set of offset LCAs depending on actual fitment and tires.
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Old Jul 9, 2014 | 11:28 AM
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Originally Posted by ssvert99
Stock 4th gen rear is 64.75 w/o the rotors.

It will work with the backspace, you may need a set of offset LCAs depending on actual fitment and tires.
Thanks gona give these wheels a shot...
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