Suspension TECH Including Brakes, Wheels and tires

          
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Old 09-23-2020, 01:36 PM
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Question 8" Wide Rims - What back spacing for 68 GTO? - Looking to run 275/60/15 drag radials

Hi - With 8" Wide Rear Rims, what back spacing do the rims need to be for 68 GTO? - Looking to run 275/60/15 drag radials.

Thanks,
Chris

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Old 09-24-2020, 08:51 AM
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4.5 , you may be able to get away with 4.


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Old 09-24-2020, 08:51 AM
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4.5 , you may be able to get away with 4.


..

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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
  #4  
Old 09-24-2020, 04:01 PM
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I run 4.5.

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Old 09-24-2020, 05:56 PM
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Quote:
Originally Posted by PunchT37 View Post
I run 4.5.
What size and brand tire do you have?

Thanks


Last edited by triathlonx13; 09-24-2020 at 06:12 PM.
  #6  
Old 09-24-2020, 07:04 PM
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Quote:
Originally Posted by triathlonx13 View Post
What size and brand tire do you have?

Thanks
Exact same tires you speak of.

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Old 09-25-2020, 09:11 AM
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Quote:
Originally Posted by PunchT37 View Post
Exact same tires you speak of.
Thanks PunchT37

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Old 09-25-2020, 01:48 PM
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I have 4.75 on 15x8 wheels with 275/60r15 tires on my 68 GTO.

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Old 09-26-2020, 09:23 AM
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Have 4.25 BS with Hoosier 275 DR’s with the car lowered 2”. Real tight fit on the outside of the wheel well. 4.5 or even 5” would be a better fit.
The Hoosiers are about 1/2” shorter than MT 275’s so I don’t think those would fit unless the back of the car was lifted a little.

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68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
13.86 @ 100
Old combo:
462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's.
1968 Pontiac GTO : 11.114 @ 120.130 MPH

New combo:
517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's
636HP/654TQ
1.452 10.603 @ 125.09
http://www.dragtimes.com/Pontiac-GTO...lip-31594.html
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