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What is the best option for A body to 4.5" bolt pattern
#1042144
07/28/11 12:22 PM
07/28/11 12:22 PM
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Joined: Jun 2005
Posts: 2,489
Tracy, New Brunswick, Canada
magnumcharger
OP
top fuel
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OP
top fuel
Joined: Jun 2005
Posts: 2,489
Tracy, New Brunswick, Canada
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I have a 1968 Plymouth Barracuda. I'm planning on replicating the Super Stock appearance with this car. When the S/S cars were built, they had their own "special" spindles and hubs, quite unlike anything else found on an other A body.
My plan WAS to change over to a pair of 1973 Dart spindles, upper A-arms and disc brakes.
Recently I've found out that by doing this, the front track is increased significantly. This is not the look I'd like to have.
Has anybody done any other swap that keeps the track width at stock? (Like the S/S package)
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: magnumcharger]
#1042146
07/28/11 09:22 PM
07/28/11 09:22 PM
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Joined: Jan 2003
Posts: 4,323
NY NY
340duster340
master
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master
Joined: Jan 2003
Posts: 4,323
NY NY
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How significant is the difference? Is out not something that a different back space wheel couldn't fix?
1966 Dart GT
...down to only 1 mopar for the first time in 15 years!
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: 340duster340]
#1042147
07/28/11 09:26 PM
07/28/11 09:26 PM
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Joined: Nov 2007
Posts: 5,337
the house on the left.
cogen80
master
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master
Joined: Nov 2007
Posts: 5,337
the house on the left.
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Quote:
How significant is the difference? Is out not something that a different back space wheel couldn't fix?
isn't it only like 3/8 of an inch?
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: cogen80]
#1042148
07/28/11 10:23 PM
07/28/11 10:23 PM
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Joined: Oct 2004
Posts: 1,074
So Cal, USA
Fab64
super stock
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super stock
Joined: Oct 2004
Posts: 1,074
So Cal, USA
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Quote:
Quote:
How significant is the difference? Is out not something that a different back space wheel couldn't fix?
isn't it only like 3/8 of an inch?
No, it's closer to 7/8" on each side:
See this linky
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: Fab64]
#1042149
07/28/11 10:44 PM
07/28/11 10:44 PM
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Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
69B3GT
top fuel
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top fuel
Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
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Quote:
Quote:
Quote:
How significant is the difference? Is out not something that a different back space wheel couldn't fix?
isn't it only like 3/8 of an inch?
No, it's closer to 7/8" on each side:
See this linky
I need to ditch my SBP disc then, My headers are close to the tires 
That 7/8" would go a long ways on my car
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: magnumcharger]
#1042152
07/29/11 12:39 AM
07/29/11 12:39 AM
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Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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the wider track is better for handling and the extra width isnt really significant...
I am truckless..
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: magnumcharger]
#1042153
07/29/11 02:34 AM
07/29/11 02:34 AM
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Joined: Oct 2004
Posts: 1,074
So Cal, USA
Fab64
super stock
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super stock
Joined: Oct 2004
Posts: 1,074
So Cal, USA
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Quote:
Although you are happy with the result of this swap on your '67 Barracuda, for me that is just too much offset.
Actually, I'm not satisfied with it. That's why I'm looking to possibly go to a narrower front wheel, with more backspacing, so it will pull them in a bit. Still not sure what I'll do. 
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: Fab64]
#1042155
07/29/11 08:37 AM
07/29/11 08:37 AM
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Joined: Jun 2005
Posts: 2,489
Tracy, New Brunswick, Canada
magnumcharger
OP
top fuel
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OP
top fuel
Joined: Jun 2005
Posts: 2,489
Tracy, New Brunswick, Canada
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Quote:
Quote:
Although you are happy with the result of this swap on your '67 Barracuda, for me that is just too much offset.
Actually, I'm not satisfied with it. That's why I'm looking to possibly go to a narrower front wheel, with more backspacing, so it will pull them in a bit. Still not sure what I'll do.
So I'm wondering...maybe by looking up the front bearing specs, and maybe the part number, there might be a possibility of finding another hub of similar dimensions that could fit onto the stock spindle? Maybe something from a Mustang, or an Explorer, or a Dakota, or ???
Or maybe - would it be possible to redrill the hub for a larger bolt pattern?
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: magnumcharger]
#1042156
07/29/11 09:00 AM
07/29/11 09:00 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
Quote:
Although you are happy with the result of this swap on your '67 Barracuda, for me that is just too much offset.
Actually, I'm not satisfied with it. That's why I'm looking to possibly go to a narrower front wheel, with more backspacing, so it will pull them in a bit. Still not sure what I'll do.
So I'm wondering...maybe by looking up the front bearing specs, and maybe the part number, there might be a possibility of finding another hub of similar dimensions that could fit onto the stock spindle? Maybe something from a Mustang, or an Explorer, or a Dakota, or ???
Or maybe - would it be possible to redrill the hub for a larger bolt pattern?
I think so...and I *think* a similar era mustang K-H rotor has the same hearings/offset but larger bolt pattern....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: patrick]
#1042157
07/29/11 11:01 AM
07/29/11 11:01 AM
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Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2734bbl
member
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member
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
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On my 67 Dart it moved the wheels out far enough with my 3.5" skinnys that it limits me to a tiny 24.5" tall tire. I would like to run a 26" tire to offset my 275/60 DRs that are 28".
I dont much care for the stink bug look nor a ton of fender gap in the front which also BTW limits front end travel.I dont really want to clip the inside of the front fenders as I have seen on some cars.
I've looked without succes in finding a wheel with enough offset to clear the fenders. I did look at some billit wheels on a Mustang that looked as if a guy might be able to machine the hub of the wheel to create more backspacing and stil be plenty safe. The center of the wheel was nearly 2.5 inches thick.
Last edited by 2734bbl; 07/29/11 11:05 AM.
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: mopfried]
#1042159
07/29/11 02:50 PM
07/29/11 02:50 PM
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Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2734bbl
member
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member
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
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Quote:
I would be interested in where this kit is avaliable. My 69 dart has disk front but the small bp. I would like to go to the 4.5 bp....
Quote:
You can get disc brake kits that will use your stock spindles and are bbp.
I've also heard that you can take your SBP rotors and have the holes filled/redrilled for BBP from Moser or the like. I would think this would be the best and cheapest option.
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: rt66jim]
#1042161
07/29/11 03:17 PM
07/29/11 03:17 PM
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Joined: Jun 2009
Posts: 438
Great Lakes Region
abodiesonly1
mopar
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mopar
Joined: Jun 2009
Posts: 438
Great Lakes Region
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Quote:
You can use 68-69 B-body frt spindles and 73 A-body disc brk upper control arms. If you don't mind using drum brakes up front.
For that matter, if you can stand to use the drum brakes, I drilled the hubs and drums to 4.5 pattern on my Dart. Drums slip on and off now also. 
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Re: What is the best option for A body to 4.5" bolt pattern
[Re: magnumcharger]
#1042162
07/30/11 01:52 PM
07/30/11 01:52 PM
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Joined: Jan 2003
Posts: 7,798
Lyons, CO
MileHighDart
master
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master
Joined: Jan 2003
Posts: 7,798
Lyons, CO
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What do you have now, drums, or the sbp KH disks ?
I just recently converted my car from sbp disks to bbp.
I kept my Kelsey Hayes disk setup (spindles, calipers, pads,) but used a 67 Mustang unicast hub/rotor which is of course 4.5" bolt pattern.
There is some machining of the hub and rotor that has to be done. The machine work cost me $200 but it worked out great. There is a thread over at forabodiesonly . com in the brake section. Lots of good info there about this swap complete with pics. But read carefully cause some if the info can be a little confusing and there is some contradicting info.
The mustang hub and the sbp mopar disk hub use exactly the same bearings, but spacing between the two bearings is different and the seal is different. The hub has to be cut where the rear bearing race fits, so that the bearing sits deeper into the hub. THis lets the hub slider farther up onto the mopar spindle, this will get the disk to be centered in the caliper. The disk diameter will also need to be cut down a little. The mustang disk is 11.25" or so and it needs to be 11" or slightly less to fit inside the mopar caliper.
I have heard that Moser no longer does the "redrilling" thing with sbp rotors, they got rid of the machine they used to use for this.
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