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Old 09-03-2009, 09:07 PM   #1
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11" rear wheels/315 tires/7" backspacing!

EDIT: Pics added at the end, showing the wheel well cuts.

Completely under the fenders, no spacers, 17" x 11" - 7" bs, on my stock 9-bolt.....Yes. 7" backspacing was pretty greedy of me, but worth it!


1. I used UMI Performance Rod Ended tubular LCAs, with the offset bushings, for the tires to clear the LCAs.

2. The bumpstops are completely cut out, as well as the outer layer of that big "bulge" above them.

3. I had to cut out some of the front inner lip, where the inner panels come together. And then BEAT THE CRAP out of the front section (inwards), to stop tire rub.

AND......Let's not forget the e-brake cables!

4. Passenger side was easy. Just unbolted the retaining loop to the rear subframe & rerouted the cable behind the swaybar end link. On the drivers side, I had to notch the caliper bracket for the e-brake (top & bottom) then bend the bracket inwards, to stop it from rubbing the inside of the wheel.

But they are on, do not rub & help some with traction. My 200,000 mile, 225hp (brand new) L98 can still light even the 315s up! Sure can feel this hook up. I wanna get a video of it launching. Judging by my small test, the tires don't lift, but the front end sure comes up!





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Custom powder coated flat black ROH Snypers w/the correct 3rd gen offset (no spacers needed, front or rear) Front--275/40R17s on 17"x9"--5" bs & custom widened & custom powder coated Rear--315/35R17s on 17"x11"--7" bs,
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Last edited by Stephen; 10-09-2009 at 11:50 PM.
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Old 09-03-2009, 09:12 PM   #2
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Re: 11"/315s/7" bs!

nice!!! now just trade those in for some 335!
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Old 09-03-2009, 09:15 PM   #3
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Re: 11"/315s/7" bs!

Those have all of 2 miles on them.....335s will come when these wear out.

But I'll hafta beat the inner panel in even more. OH WELL!
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Old 09-03-2009, 09:45 PM   #4
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Re: 11"/315s/7" bs!

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Those have all of 2 miles on them.....335s will come when these wear out.

But I'll hafta beat the inner panel in even more. OH WELL!
its cool man , ill just stop by and wear em out for ya
i mean.....
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Old 09-04-2009, 03:37 PM   #5
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Re: 11"/315s/7" bs!

looks good stephen, they sit right about where i would like to see them. Good job, have you driven the car yet? see if they rub while turning at all

7" of BS, please, try fitting 8.5"
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Old 09-04-2009, 04:20 PM   #6
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Re: 11"/315s/7" bs!

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looks good stephen, they sit right about where i would like to see them. Good job, have you driven the car yet? see if they rub while turning at all

7" of BS, please, try fitting 8.5"
8.5" would most definately require a tub of some kind & a 4-link?. Not sure if just a mini tub would clear that!

My fronts are still the stock 5" bs. Never rubbed from day 1, with the 275s.

On the rear, with the offset LCAs for clearance & the solidness of the rod ends (PHB & LCAs) , the rears doesn't move side to side any.

The LCA rod ends (i suspect is the "culprit") makes for some definite clunking over road irregularities. Not looking forward to hitting rail road crossings at 60mph!
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Old 09-04-2009, 04:52 PM   #7
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Re: 11"/315s/7" bs!

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8.5" would most definately require a tub of some kind & a 4-link?. Not sure if just a mini tub would clear that!
sure it does, its actually what im running, with a minitub and some other custom doo-dads.

What tires are you using? Have any pics of the inner wheel wells?
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Old 09-04-2009, 06:38 PM   #8
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Re: 11"/315s/7" bs!

hehe... sweet. Looks great.
this makes me wanna try the 305/30R18s all around even more.
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Old 09-04-2009, 06:47 PM   #9
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Re: 11"/315s/7" bs!

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sure it does, its actually what im running, with a minitub and some other custom doo-dads.

What tires are you using? Have any pics of the inner wheel wells?
Summitomo 315/35s & I have taken any pics yet, because I haven't welded it shut yet.

I wanted to test drive it first & check for any rubbing, before I bothered welding. It would suck to weld it, then find out I had to cut it up again & re-weld it all over.

Quote:
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hehe... sweet. Looks great.
this makes me wanna try the 305/30R18s all around even more.
305s would be easier & WAY easier, if you don't get greedy on the bs, like I did, to fit on stock style suspension & minimal sheetmetal work (which turned out to be not-so-quite minimal!
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Old 09-04-2009, 06:59 PM   #10
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Re: 11"/315s/7" bs!

From what I looked at, the 305 tire selection is alot better on the 18s as well. The fun part would be getting the backspacing and stuff right on the front. A little less common knowledge and more to hit up there.
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Old 09-04-2009, 07:29 PM   #11
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Re: 11"/315s/7" bs!

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From what I looked at, the 305 tire selection is alot better on the 18s as well. The fun part would be getting the backspacing and stuff right on the front. A little less common knowledge and more to hit up there.
The extra half inch in diameter isn't gonna make that much of a difference in the rear. And by pulling the wheel out even a half inch (less bs), would help.

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Old 09-04-2009, 07:47 PM   #12
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Re: 11"/315s/7" bs!

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From what I looked at, the 305 tire selection is alot better on the 18s as well. The fun part would be getting the backspacing and stuff right on the front. A little less common knowledge and more to hit up there.
305/18 is not a common size is it? i have only seen one or two tires with that size. 295's have shatloads
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Old 09-05-2009, 01:03 PM   #13
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Re: 11"/315s/7" bs!

I know the difference in diameter wouldn't have a large effect on fitment, I was reffering to getting everything to clear up front for turning lock to lock.

Yeah, my bad. 315/30s- 12 tires, 305/30- 4 tires, 295/35- 21. My head wasn't in gear.
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Old 09-10-2009, 12:02 PM   #14
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Re: 11" rear wheels/315 tires/7" backspacing!

Can you repost those pictures Stephen? They're showing the Photobucket "The images have been moved or deleted."
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Old 09-10-2009, 12:54 PM   #15
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Re: 11" rear wheels/315 tires/7" backspacing!

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Can you repost those pictures Stephen? They're showing the Photobucket "The images have been moved or deleted."
I did a lot of "house cleaning" in my Photobucket & didn't realize this thread was gonna be affected.

Pics now fixed, in the original Post.
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Old 09-11-2009, 01:08 AM   #16
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Re: 11" rear wheels/315 tires/7" backspacing!

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I did a lot of "house cleaning" in my Photobucket & didn't realize this thread was gonna be affected.

Pics now fixed, in the original Post.
Awesome...you think if I put the ASA's or ADR's in the same position i'll be able to get them to fit? Do you have pictures of the beating/cutting you did??
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Old 09-11-2009, 01:12 AM   #17
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Re: 11" rear wheels/315 tires/7" backspacing!

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Awesome...you think if I put the ASA's or ADR's in the same position i'll be able to get them to fit? Do you have pictures of the beating/cutting you did??
No pics yet. It still isn't welded shut yet. Really sucks trying to weld, laying on your side on the ground. Gonna take it to where I can borrow a lift & weld it then.
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Old 09-11-2009, 01:23 AM   #18
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Re: 11" rear wheels/315 tires/7" backspacing!

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Awesome...you think if I put the ASA's or ADR's in the same position i'll be able to get them to fit? Do you have pictures of the beating/cutting you did??
Oh....Get the BS right & you can do anything. I just wish the centers were further back. I'd love to have a deeper dish. Deeper wheels, are the only thing that will get me to switch away from my Snypers.
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Old 09-11-2009, 12:28 PM   #19
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Re: 11" rear wheels/315 tires/7" backspacing!

Thats a pretty good lookin rear end u got there.

You got any pics from the side, its making me think i should go with 315s
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Old 09-11-2009, 12:51 PM   #20
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Re: 11" rear wheels/315 tires/7" backspacing!

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Thats a pretty good lookin rear end u got there.

You got any pics from the side, its making me think i should go with 315s
I didn't, but now I do, thanks to the wonderful age of digital cameras!

Side view is no different than with the 285s I had, other than maybe the height difference of new tires sidewalls vs worn out tires sidewalls. Looks no different to me, since the wheels sit exactly where they did before.

Last edited by Stephen; 09-17-2009 at 09:04 PM.
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Old 09-12-2009, 06:01 AM   #21
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Re: 11" rear wheels/315 tires/7" backspacing!

Thanks for the pic, u'vre gotta nice lookin ride there
any new pics u get psot em i wouldnt mind seeing them
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Old 09-18-2009, 05:01 PM   #22
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Re: 11" rear wheels/315 tires/7" backspacing!

Looks good.....now fix the mirror.
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Old 09-18-2009, 05:05 PM   #23
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Re: 11" rear wheels/315 tires/7" backspacing!

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Looks good.....now fix the mirror.
My mirrors aren't broke.....
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Old 09-18-2009, 05:15 PM   #24
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Re: 11" rear wheels/315 tires/7" backspacing!

please post a pic of the wheelwells with the wheels and tires removed?
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Old 09-18-2009, 05:17 PM   #25
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Re: 11" rear wheels/315 tires/7" backspacing!

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please post a pic of the wheelwells with the wheels and tires removed?
I'll get pics, when it is fully welded & finished.
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Old 09-18-2009, 05:32 PM   #26
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Re: 11" rear wheels/315 tires/7" backspacing!

TIA.
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Old 09-18-2009, 05:38 PM   #27
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Re: 11" rear wheels/315 tires/7" backspacing!

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My mirrors aren't broke.....
In your pics, one is a third gen and the other is a forth. Maybe you like it that way. lol
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Old 09-18-2009, 05:50 PM   #28
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Re: 11" rear wheels/315 tires/7" backspacing!

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In your pics, one is a third gen and the other is a forth. Maybe you like it that way. lol
I figured that ia what you meant, but I wasn't gonna point them out. Thanks for pointing it out to everyone to see!

A deer took out my passenger side, so I put that one on & haven't done the other side.
Pics during the mirror Install

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Old 10-09-2009, 11:39 PM   #29
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Re: 11" rear wheels/315 tires/7" backspacing!

You know where the bumpstop is, above the axle? That has to be cut out. (below the red square)


The the red boxed area above that, has to come out. It is 2 layers & only the top layer is a bump. Just cut out the top layer.



Sorry, no pic for this step, but just weld in a new flat plate to bring it back to 2 layers, but flat.

I also had to trim where the back of the forward-most part of the tire rubbed the inner fender. The sledgehammer couldn't move it far enough, so I had to break out the cutting wheel, that I used on the bumpstop.

So it took an adjustable PHB.....Offset tubular LCAs.....And body cutting. All easy stuff really.

I was cutting, test fitting the wheel...cutting, test fitting, cutting, test fitting, cutting.........You get the picture. Now I know just to CUT. 1st side took all day......I did my 2nd side in 1 shot!
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Old 10-10-2009, 12:45 PM   #30
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Re: 11" rear wheels/315 tires/7" backspacing!

I'm glad to see the pics, but now it seems really dumb that GM put the bulge in there.
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Old 10-10-2009, 12:48 PM   #31
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Re: 11" rear wheels/315 tires/7" backspacing!

The rubber bump stop is directly below it, so I'd suspect it was designed for structural strength, in case of the axle hitting the bump stop hard.

Without it now, my axle would shove right up into the rear "subframe".

Last edited by Stephen; 10-10-2009 at 12:54 PM. Reason: mispelling fixed
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Old 10-10-2009, 05:37 PM   #32
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Re: 11" rear wheels/315 tires/7" backspacing!

nice job!!
I bet I can fit 8.5 bs on 11"x18s with no tub on my 4th gen rear

Last edited by 383fbod; 10-11-2009 at 04:18 PM.
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Old 10-30-2009, 07:43 PM   #33
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Re: 11" rear wheels/315 tires/7" backspacing!

I haven't looked under my car in a while to see where everything is located and what not, but can't you just weld in the bumpstop on the other side of the "frame" section, or is it too close to the spring then? If it is, what about putting it directly below the "frame?" I'm just thinking out loud...
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Old 10-30-2009, 08:45 PM   #34
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Re: 11" rear wheels/315 tires/7" backspacing!

Quote:
Originally Posted by racing geek View Post
I haven't looked under my car in a while to see where everything is located and what not, but can't you just weld in the bumpstop on the other side of the "frame" section, or is it too close to the spring then? If it is, what about putting it directly below the "frame?" I'm just thinking out loud...
I suspect there wouldn't be room, but I dunno FOR SURE.

I have yet to have the axle hit the rear subframe any, but of course, I also don't go 4 wheeling or jumping curbs with it.

Last edited by Stephen; 10-30-2009 at 08:50 PM.
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