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How to prepare the 4th gen firebird for 28x10.50s?

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Old 12-19-2008, 07:34 AM   #1
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Default How to prepare the 4th gen firebird for 28x10.50s?

currently on stock rear springs with no upper rubber isolator, lips already rolled, air bags in both, adj lower control arms, adj TA...

I'm going to test fit and see, but what will I have to do to make it work (i've done the searches to no avail) on my 93 Formula?

Thanks
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Old 12-19-2008, 06:52 PM   #2
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ive got a 28x11.50x15 et drag on a 15x12 wheel on my 95 firebird. they dont rub
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Old 12-20-2008, 04:24 PM   #3
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Quote:
Originally Posted by White Lightning View Post
ive got a 28x11.50x15 et drag on a 15x12 wheel on my 95 firebird. they dont rub
don't know how that's possible...these 28x10.50s scrub front and back...do you have the inner wells cut completely out...mine scrubs the front inner AND the bumper cover...LCAs adj all the way in...not happening and I'm growing frustrated.

Any tips?

spacer would clear the front but make the rear worse...gosh, somebody has the key to making this work...
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Old 12-20-2008, 08:03 PM   #4
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Where the frame rail ties in behind the front of the fender well on mine we had to air hammer to stop them from rubbing, other than that, just the BFH mod.
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Old 12-22-2008, 12:26 PM   #5
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no i didnt cut anything out, just used a bfh as mentioned above, mine fit perfectly, no rubbing at all even with 3 people in the car
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Old 12-22-2008, 04:41 PM   #6
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lots of cutting and hammering
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Old 12-22-2008, 05:24 PM   #7
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Quote:
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lots of cutting and hammering
yup....
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Old 12-23-2008, 05:20 AM   #8
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Quote:
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lots of cutting and hammering
I honestly backed off the 28x10.50s...broke them down yesterday and am selling them, keeping the 15x10s, going to be in search for a slightly smaller tire. It is what it is...my camaro ss wouldn't have had this extreme problem fitting bacause of how the bumper is shaped. However, this formula had the front and rear scrubbing even after the BFH mod to the inner well...could turn the tire at all. I would have had to cut the rear bumper to the outside..not just inside even with the LCA fully adjusted in. Found out I need LCA relocation brackets to move them enough...but even if I could move them further up...already scrubbing up front.

Thanks for the info!

this pic is w/ the jack under the diff...so close to ride height...and won't spin...scrubs up front and on rear bumper.
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How to prepare the 4th gen firebird for 28x10.50s?-tc-prostars-28x10.50.jpg  
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Old 12-23-2008, 07:08 AM   #9
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i just had to trim the front of the bumper cover for the 28s on my SS and had to cut the **** out of it for the 29x10 hoosiers
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Old 12-23-2008, 08:16 AM   #10
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Quote:
Originally Posted by alan2000T/A View Post
I honestly backed off the 28x10.50s...broke them down yesterday and am selling them, keeping the 15x10s, going to be in search for a slightly smaller tire. It is what it is...my camaro ss wouldn't have had this extreme problem fitting bacause of how the bumper is shaped. However, this formula had the front and rear scrubbing even after the BFH mod to the inner well...could turn the tire at all. I would have had to cut the rear bumper to the outside..not just inside even with the LCA fully adjusted in. Found out I need LCA relocation brackets to move them enough...but even if I could move them further up...already scrubbing up front.

Thanks for the info!

this pic is w/ the jack under the diff...so close to ride height...and won't spin...scrubs up front and on rear bumper.
looks like to me the backspacing is wrong on the wheel. u should have 7.5 with a ten inch wheel, looks like u have a 5.5 bs. unless u have a narrowed rear i would double check the backspacing
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Old 12-23-2008, 08:26 AM   #11
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Quote:
Originally Posted by White Lightning View Post
looks like to me the backspacing is wrong on the wheel. u should have 7.5 with a ten inch wheel, looks like u have a 5.5 bs. unless u have a narrowed rear i would double check the backspacing
good idea, but I have the 8s w/ 5.5" BS sitting there beside it and they both sit the same on the outside, so it is 7.5. No biggy, just movin on to something else.
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old setup...
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Old 12-23-2008, 02:53 PM   #12
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Offset LCA's and rolling the fenders.

Both which I have for sale.

PM me if you need help or more info.
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Old 12-23-2008, 02:53 PM
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