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Stupid question...why narrow the rearend?

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Old 05-16-2006, 12:42 PM
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car looks great tom, looking forward to seeing it at prp.
Old 05-16-2006, 08:51 PM
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i got a new backround for my computer...bad *** guy
Old 05-16-2006, 09:06 PM
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Tom.. What transmission are you running and what rear gear ratio? I was thinking that I could get a 29in tire under my car without mini tubbing it, but I don't know. My rear is narrowed 3in per side like yours, but my wheels are only 5in BS. I have lots of room on the outside of the wheel, but not much at all on the inside. I will probably end up running a 28x10.5W so that I don't have to make a gear change.
Old 05-16-2006, 09:29 PM
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Originally Posted by 1QuickT-A
Tom.. What transmission are you running and what rear gear ratio? I was thinking that I could get a 29in tire under my car without mini tubbing it, but I don't know. My rear is narrowed 3in per side like yours, but my wheels are only 5in BS. I have lots of room on the outside of the wheel, but not much at all on the inside. I will probably end up running a 28x10.5W so that I don't have to make a gear change.
Powerglide with 4.56 out back. I had a 30" X 10.5" tire on the car with a 10" X 15" wheel and 7.5" BS without a minitub. But i couldn't lower the car without the minitub and keep the big tire too.

thanks boondiggys. Thanks for the props man.

ss2000 How are you man? I'm racing at Thompson this year. I'll be at PRP a couple of times.

W stands for wide. You guys need to look at your current sidewall width and BS. How much room do you have now with your current sidewall width and BS?
Old 05-16-2006, 11:22 PM
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Right now I have about 3/4 of an iinch on the inside between the sidewall and LCA.. This is with standard lca's.. I do not have offset arms quite yet. I have 2-3 inches "i think" on the outside between the sidewall and the fender well lip which has already been rolled.

The car currently has 28x10.5 non W tires on it now. I am only running a 3.50 gear so I need to stay with a 28in tire unless I go with a 3.90+ gear later on. I'm pretty sure I could fit a 28x10.5W under it after I get the offset arms.

Tom, did you try to tuck the 30in tires BEFORE you put the tubs in and after you had the rear narrowed 6inches? With the 28's I should be able to lower the car a little bit more.
Old 05-16-2006, 11:38 PM
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Originally Posted by gator's 99TA
rev time, why do you think you have to "back half" the car?

you can narrow the rear up to 3" if you stick with a 10.5" wide tire on a stock tub and offset LCA. if you are going to narrow might as well go for it and if you want a big tire later you have the option to mini tub. then you can look like tom the roofers car.
That would work out pretty good then, I run 15x10 Pro Stars with a 5.5 BS now but they stick out a bit. I love the way the rims look, dished not almost flat like a 7.5 BS would look so this may be what I am looking for.
Thanks
Old 05-17-2006, 06:39 AM
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Originally Posted by 1QuickT-A
Right now I have about 3/4 of an iinch on the inside between the sidewall and LCA.. This is with standard lca's..
How much clearance do you have between your tire sidewall and the frame? Measure the area where the frame has the horizontal ridges.

Tom, did you try to tuck the 30in tires BEFORE you put the tubs in and after you had the rear narrowed 6inches? With the 28's I should be able to lower the car a little bit more.
With stock rear end width and stock location LCA's:
I had the 30" tires under the car but they just fit after grinding the frame area with the horizontal ridges and some massaging the wheel well with a BFH. The 30" tire I ran last year had a 13.1" sidewall width and I had approx. 1/4" clearance from the ground down frame area. I don't remember the LCA clearance but I know it didn't come into play at the time.
Old 05-17-2006, 06:48 AM
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If your just looking for the deep dish look then get the rear shortened 3" per side and change BS. In my case I was previously running 7.5" BS with a stock rear end width, so If I would have shortened the rear 3" per side and then changed to 4.5" BS the tire would be in the exact same location. Right I just wouldn't have been able to lower the car with the big 30" tire without a mini tub and offset LCA's.
Old 05-17-2006, 09:14 AM
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28x10.5W on 15x10 7.5"BS Prostars. No narrowing/tubbing. Just some use of the BFH and trimmed the rear bumper a little. Looks fine to me, but yeah, can't lower it much if I wanted to. If anything, the fronts are what stick out too much cause of the necessary spacers.
Old 05-17-2006, 01:25 PM
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I'm gonna try 3.5"-4" narrowing and run a 4"b.s. to see where I end up at.
Old 05-17-2006, 03:22 PM
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Does the rear have to be narrowed from the factory....or can you do it after.

Meaning...can I have my Moser 12 bolt narrowed now?

How big does the tire have to be to have to narrow the rear end. Would a 325 MT DR (15") need narrowing to make it fit well within the fender?
Old 05-17-2006, 03:55 PM
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Originally Posted by DopeFedZ
I'm gonna try 3.5"-4" narrowing and run a 4"b.s. to see where I end up at.
I just called and ordered mine from Moser and they said 3.5" per side was all they could get without moving the factory mounting points.
Old 05-17-2006, 03:56 PM
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Originally Posted by mike#9
Does the rear have to be narrowed from the factory....or can you do it after.

Meaning...can I have my Moser 12 bolt narrowed now?
I think you can just send it back and they will narrow it for you...not sure on the cost tho.
Old 05-17-2006, 04:00 PM
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Originally Posted by mike#9
Does the rear have to be narrowed from the factory....or can you do it after.

Meaning...can I have my Moser 12 bolt narrowed now?

How big does the tire have to be to have to narrow the rear end. Would a 325 MT DR (15") need narrowing to make it fit well within the fender?
Plenty of race fab shops can narrow your rearend. Just call them up and ask if they can do it for you.
Old 05-17-2006, 04:01 PM
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Originally Posted by jshiver
I just called and ordered mine from Moser and they said 3.5" per side was all they could get without moving the factory mounting points.
3.5" should work. I've seen others cut 4 and 5 inches before with the factory mounting points.
Old 05-17-2006, 04:09 PM
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Originally Posted by mike#9
Does the rear have to be narrowed from the factory....or can you do it after.

Meaning...can I have my Moser 12 bolt narrowed now?

How big does the tire have to be to have to narrow the rear end. Would a 325 MT DR (15") need narrowing to make it fit well within the fender?
It's probably more trouble and $$$ to have shipped back and have it reworked than just buying a new one.

Narrowing the rear end has nothing to do with tire size. More like weight reduction and improving on the strength of the axles.

SJM can make a set of custom rims to get the tire centered in the wheel well. That doesn't mean you can run a big tire and not have to do some trimming or hammering.
Old 05-17-2006, 05:04 PM
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Originally Posted by sscam68
It's probably more trouble and $$$ to have shipped back and have it reworked than just buying a new one.

Narrowing the rear end has nothing to do with tire size. More like weight reduction and improving on the strength of the axles.

SJM can make a set of custom rims to get the tire centered in the wheel well. That doesn't mean you can run a big tire and not have to do some trimming or hammering.

I thought that people did it to fit more tire under the car?

Also....you are saying that it would be more money to have my current 12 bolt narrowed compared to just buying a new rearend??
Old 05-17-2006, 05:22 PM
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wow lots of questions that can be answered with the search feature.

1) narrowing a rear affects the size of the tire you can run. tuck the wheel in too much and you will run into clearance issues. then you mini tub

2) you can order a rear narrowed as much as you want. cost is the same. weight reduction and stronger axles as above said.
Old 05-17-2006, 05:23 PM
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I had my Ford 9" narrowed for *edit $180*. I meant to type $180

Last edited by Tom the roofer; 05-17-2006 at 09:03 PM.
Old 05-17-2006, 08:46 PM
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I had mine narrowed from Moser also. it was right around 200 plus shipping


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