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9" narrowed or not

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Old 01-13-2011, 11:38 AM
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Default 9" narrowed or not

well tax retrun time is just around the corner and its time to get a rearend for my build so i need to start planing i am going to run a 9" just not sure which one probably mwc or moser. should i get a narrowed rear or not i would like to run a deep dish wheel i am thinking about going with the weld s71 rt-s wheels in 15x11.25 with a 4.5BS with a 325/50/15 mt et drag raidal how narrow would i have to go to fit that combo if possible i dont want to run a offset control arm any suggestions would help
Old 01-13-2011, 12:05 PM
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Not sure on that wheel size, but if you shorten each side at -3 inches per side, you can run a 15x10 4.5BS wheel. I had that size wheel with 325/50/15 MT DRs and it was a perfect flush fitment.
Old 01-13-2011, 12:15 PM
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i saw your post and you said it was narrowed 3" a side i was wondering what the BS was on your set up do you have any more pics
Old 01-13-2011, 12:36 PM
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Nope only those pictures I posted. I sold the wheels lol.
Old 01-13-2011, 02:28 PM
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Mine is narrowed 3" per side and I run the weld rt-s in 15x10 with 4.5" backspace and 325/50/15 mickeys. Here's some pics, if you want more lemme know.





Old 01-13-2011, 02:51 PM
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that looks efffin sick thanks for the pics so is 3" a side about the most your can go with out running in to problems
Old 01-13-2011, 02:56 PM
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You can do -3 per side before having to worry about altering anything on the housing itself.
Old 01-13-2011, 03:26 PM
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ok so my option is pretty much the 15x10 4.5BS the 11" wheel wont fit

Originally Posted by MidwestChassis
You can do -3 per side before having to worry about altering anything on the housing itself.
thanks i am thinking about getting one of your rearends do you think you can get me a quote on one
Old 01-13-2011, 03:45 PM
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say someone was to narrow 3" on each side and run a wheel like that, would they have to modify the wheel wells? like move them inward more?
Old 01-13-2011, 04:08 PM
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Is there any benefit to running a rear that is narrowed 3" on both ends and rims with 4.5" BS instead of stock width with 7.5" BS?

Is there a better selection of rims available with 4.5" BS?
Old 01-13-2011, 09:11 PM
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Originally Posted by Valkyn
Is there any benefit to running a rear that is narrowed 3" on both ends and rims with 4.5" BS instead of stock width with 7.5" BS?

Is there a better selection of rims available with 4.5" BS?
It's mostly for cosmetics (deeper dish, better wheel selection) but as a side benefit it reduces unsprung and rotational weight a little bit by losing 6" of axle shaft and housing tube.
Old 01-13-2011, 09:27 PM
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I did it for the looks and weight, I would get the offset lca for sure, Installed mine and tires would be very close if not touching if I didnt get the offset.
Old 01-14-2011, 03:34 AM
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Originally Posted by turbo4.8
say someone was to narrow 3" on each side and run a wheel like that, would they have to modify the wheel wells? like move them inward more?
Nope, with the correct wheel backspacing the wheels will be in the same location as they would be with a standard length rear end. Bob
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Old 01-14-2011, 07:00 AM
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Taking 3" off the axle will pull the tire in 3" as well. This is why you reduce your b.s. by 3" to keep it centered. I oredered my MWC yesterday narrowed 3"/side and will be going with the 15x10 4.5" bs to put my 275 /60 mt radial in the exact same spot it sits now. You shouldn't have a problem fitting up to the 295/55 28" tire without any use of the BFH but if you go with the 325 tire, you will have to do some beating and perhaps cutting of the bumpstops as most do for it to fit. If you want the deep dish look without the added rotational weight and you can get by with a narrower tire such as the 275, then i would suggest it. Those 325's are HEAVY!!

Good luck!

jimm98ls1.....Your car and another on here with that same setup on an lt1 car take turns as my screen saver!!!!! AWESOME!!!
Old 01-14-2011, 09:43 AM
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If you were stuck on running the rim that you mentioned your rear would need to be 56.2" overall length (thats 4.25" per side) and you would most likely run into problems with control arm clearance.
Old 01-14-2011, 02:55 PM
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Originally Posted by bigpat501
ok so my option is pretty much the 15x10 4.5BS the 11" wheel wont fit



thanks i am thinking about getting one of your rearends do you think you can get me a quote on one
PM sent, if you have any more questions just let me know.
Old 02-16-2011, 10:53 AM
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if you were to narrow 4" a side what needs to be modified ..Pan hard mount , narrow the control arm mounts ? I think i am gonna go to wishbone and delete the PH anyways ...
Thanks in advance Dave



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