Whats the Rule of Thumb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bobalouie · 05-20-2004, 04:33 PM

What is the rule of thumb regarding lifts/tire sizes on a 67-72 truck. The reason that I am asking is that I want to run a 4 in lift w/ 35x12.5x15 tires, but I dont know how much I am going to rub. I also dont know what backspace I should use. Should I be going w/ a 6 inch lift instead? What do You guys think?

Bob

1972 K10 SWB

**Yukon Jack** · 05-20-2004, 05:45 PM

If you aren't going to do much wheeling, you should be fine with a 4" lift and 35's. They might rub a little in a tight turn, mine never did when I had a 4" lift. I don't recall my exact back spacing but I think it was 4.5 on an 8" rim.

ljbear · 05-20-2004, 11:01 PM

I'll second that. If I really crossed it up I could get a little rub, but for light wheeling the 35's were never a problem rubbing. I had 3:73 gears so the worst part was getting them turning from a stop.

bodazpa · 05-21-2004, 05:38 AM

35`s with a 4" lift will fit a lot better with 8" wheels than 10" wheels. It also depends on what brand tire you run. Some 35`s are bigger than others.....I was gonna put 35" pj`s on my 71 with a 4" lift and 10" wheels, but they would hit real bad so I went with the 33`s which actually measure 34.5".....John

05-20-2004, 04:33 PM	#1
Bobalouie Fetzer Valve Technician Join Date: Jun 2003 Location: Stillwater, OK Posts: 205	Whats the Rule of Thumb What is the rule of thumb regarding lifts/tire sizes on a 67-72 truck. The reason that I am asking is that I want to run a 4 in lift w/ 35x12.5x15 tires, but I dont know how much I am going to rub. I also dont know what backspace I should use. Should I be going w/ a 6 inch lift instead? What do You guys think? Bob 1972 K10 SWB

05-20-2004, 05:45 PM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,683	If you aren't going to do much wheeling, you should be fine with a 4" lift and 35's. They might rub a little in a tight turn, mine never did when I had a 4" lift. I don't recall my exact back spacing but I think it was 4.5 on an 8" rim. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

05-20-2004, 11:01 PM	#3
ljbear Registered User Join Date: Jan 2003 Location: Emmett, Idaho Posts: 858	I'll second that. If I really crossed it up I could get a little rub, but for light wheeling the 35's were never a problem rubbing. I had 3:73 gears so the worst part was getting them turning from a stop. __________________ Larry 72 Chevy SWB 4x4 71 Chevy SWB 4x4 My Work Truck "Don't confuse enthusiasm with capability"

05-21-2004, 05:38 AM	#4
bodazpa Registered User Join Date: Feb 2002 Location: 283 Small Block ln. apt k10 Chevyland N.J. Posts: 261	35`s with a 4" lift will fit a lot better with 8" wheels than 10" wheels. It also depends on what brand tire you run. Some 35`s are bigger than others.....I was gonna put 35" pj`s on my 71 with a 4" lift and 10" wheels, but they would hit real bad so I went with the 33`s which actually measure 34.5".....John __________________ 71 chevy 4x4 ,np205 transfer case, 3 speed tranny, sjs 283, 4in suspension lift, and 71 hugger orange paint,33x12.5 parnelli jones on 15x10 m/t classicII, cowl hood,new bed painted, linex liner. Truck has been completed since 2005.... 2003 Chevy Avalanche Z71, on 6in super lift w/ 35in tires RNG4x4 aka the "Redneck Roller" words to live by "If it fits, it fits" "friends help you move, real friends help you move bodies..." Sponsored by "Kick Ass Kustom"



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