72 340 Duster rear tires rub springs-what gives??
#1093936
10/13/11 10:26 PM
10/13/11 10:26 PM
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Joined: Jan 2006
Posts: 3,535 Canuckville
68Cbarge
OP
master
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OP
master
Joined: Jan 2006
Posts: 3,535
Canuckville
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A customer upgraded from factory 14 inch big bolt pattern Ralleyes in the rear to 15X8 Ralleye repops he supplied and ordered from Summit.#56-5812042 He got the backspacing of 4.5". In theory and on paper this should have worked on this car. I sold him 2556015 Mickey Thompson's to help fill out the rear wheel well. Not knowing the car's history or any other modifications,it is hard to say what else has been monkeyed with. Don't get me wrong,this car is really nice and is a strong runner. The car was upgraded by a previous owner with disc brakes up front and an unknown 8-1/4 rear axle. Big bolt pattern all the way around. At this point,I am only trusting the customer's judgement-it is his car after all and he bought it restored. Even with the 255's the dang tires rub the leaf springs. What gives?? Too much backspacing?? 15X8 was ordered with the intent to go bigger in tire sizes or go slicks in the future. I plan on measuring the axle width flange to flange and do a proper backspacing measurement with the wheels off. I am also going to test fit some mounted cop wheels and Centerlines with 2756015 on them as well. Ya think that after owning and driving the car for 6 years he would KNOW HIS CAR and HE SUPPLIED THE RIMS. I really do not want to eat the damaged tires because of this and the measuring hopefully will save grace for me and my shop. I feel bad about since he trusted my recommendations,plus the owner is a nice guy.
Neither he or anybody else can determine if the rear is a correct A body or a Dakota rear diff until I get the car back in the shop for a closer look. I had seen many other Dusters with fatter tires and wide rims to a certain extent where no spring relocation or mini tubs were not needed--yet,LOL. I have been around Mopars almost all my life and this has got me stumped.I never seen such a moderate size tire do that before. Any help is greatly appreciated. Thanks in advance.
'68 Newport Custom Barge on a Budget!! BOAB 1973 Satellite WAGON! 318- 3 on the tree!! 2008 Chrysler 300c HEMI!
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Re: 72 340 Duster rear tires rub springs-what gives??
[Re: 74fldart]
#1093938
10/13/11 11:09 PM
10/13/11 11:09 PM
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Joined: Jan 2006
Posts: 3,535 Canuckville
68Cbarge
OP
master
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OP
master
Joined: Jan 2006
Posts: 3,535
Canuckville
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Thanks. I wrote down the stock width you mentioned. Are your rims 15X7 or 15X8??
Last edited by 68Cbarge; 10/13/11 11:14 PM.
'68 Newport Custom Barge on a Budget!! BOAB 1973 Satellite WAGON! 318- 3 on the tree!! 2008 Chrysler 300c HEMI!
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Re: 72 340 Duster rear tires rub springs-what gives??
[Re: 69B3GT]
#1093940
10/14/11 02:19 AM
10/14/11 02:19 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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I had 15x8 chrome modular rims and 255 60 15 with no problems. I think the backspace was 3.5 or 4".
OT,, a side note do you have good prices on MT tires?
I am truckless..
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Re: 72 340 Duster rear tires rub springs-what gives??
[Re: crlush]
#1093942
10/14/11 11:27 AM
10/14/11 11:27 AM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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In my experience this combo is the biggest that could be fit PERFECTLY on a 71 Demon with no spring or body modifications. Enough clearance for the tires inboard and outboard with room for growth and side wall flex, no rubbing anywhere. Mickey Thompson 255 60R15 ET Street Drag Radials 27.00 dia. Summit Racing 15 x 8 SBP Wheel (4.250 back spacing is the key) Code WVI-61-5754044 205 75R 14 on the front, also 27.00 dia The cars stance with this combo is right on the money as well.
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Re: 72 340 Duster rear tires rub springs-what gives??
[Re: GO_Fish]
#1093947
10/15/11 12:00 AM
10/15/11 12:00 AM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
A 4.25 BS would probably be ideal for my car but i don't think that offset is available in a 15x8 ralley.
Yes they are, see my post and Summit number
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Re: 72 340 Duster rear tires rub springs-what gives??
[Re: ScottSmith_Harms]
#1093949
10/15/11 01:29 AM
10/15/11 01:29 AM
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Joined: Nov 2006
Posts: 1,462 oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,462
oklahoma
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Quote:
Quote:
A 4.25 BS would probably be ideal for my car but i don't think that offset is available in a 15x8 ralley.
Yes they are, see my post and Summit number
The wheel you link to is a 15x 7. A 7 inch rim would have worked okay with my 275/60s but i prefer the 8 inch. The tire rubbing is not really an issue for me as i plan to build an 8.75 rear to replace the 8.25. When i have my C body 8.75 housing narrowed, i'll just have it left slighty wider than stock A body width.
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Re: 72 340 Duster rear tires rub springs-what gives??
[Re: topside]
#1093951
10/15/11 04:21 PM
10/15/11 04:21 PM
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Joined: Jan 2006
Posts: 3,535 Canuckville
68Cbarge
OP
master
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OP
master
Joined: Jan 2006
Posts: 3,535
Canuckville
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Thanks to all for the info and opinions. Loading up the waygun tomorrow with a selction of tires,rims,a yard stick sand measuring tape. Gonna get to the bottom of this. Cheers.
'68 Newport Custom Barge on a Budget!! BOAB 1973 Satellite WAGON! 318- 3 on the tree!! 2008 Chrysler 300c HEMI!
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