How High w/40s? (`72) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 08-20-2005, 10:33 PM

How much lift does it take to run 40" tires on a 67-72 truck?

bouncytruck · 08-20-2005, 11:48 PM

At least 4.56 would be my guess. I've got 4.10's in my '69 and they seem to be correct for 35's. I had 3.73's in my first blazer with 35's and it was a bit sluggish. My '72 has stock 3.07's with 237/85/16 (about 31.5" tall) and it could probably stand to have seom 3.73's.

Mudder · 08-21-2005, 12:31 AM

Are you talking lift or gears?

bouncytruck · 08-21-2005, 12:36 PM

Looks like I read it wrong... Just because I look dumb, doesn't mean I'm not!

Mudder · 08-21-2005, 01:28 PM

LMAO......... I read it about 5 times.

Mudder · 08-21-2005, 01:29 PM

I would start out guessing with a 12 inch lift.

**special-K** · 08-21-2005, 02:06 PM

That`s funny.Bouncy,thanks for answering the question I didn`t ask.I don`t think I was going to ask,but maybe you know more than me.I have CUCV axles w/4.56 gears.Mudder67,12" you think?I`ll be building a long Stepside w/doublers.I want it to be B/A,but not sure I want that much lift.I`m thinking Swampers.I`ll look at sizes,maybe go down a notch in size.Then again,that would be B / A!!

1969 GMC · 08-21-2005, 02:54 PM

special K, have you considered a 52" spring swap up front? it adds lift and more flex at the same time. i recently got a pair of 52's and have been thinking about using them, but pretty much my entire truck is still in the "planning" phase. there is lots of info on CK5 about this.

GMC71k20 · 08-21-2005, 05:24 PM

40x17 with 8. the 8" lift has settled a little bit since then. the owner of the tires used them on his truck with a 6" lift and a 3" body lift. he said it rubbed a little.

GMC71k20 · 08-21-2005, 05:24 PM

2wdBlazer · 08-22-2005, 01:39 PM

Mine rubs with mild flexing with 9 inches. My 38's are actually 38.2. The real question is are your 40's really measuring 40. Lots of tires don't meausure up as advertised.

**JIMs70GMC** · 08-22-2005, 01:55 PM

Get some of those michellins that are mounted on 6.5" wide rims and measure 40" tall. You could probably get by w/ 8".

big70chevy · 08-22-2005, 11:05 PM

Would you be interested in the new 12" lift I've got for sale. Will let it go for $1800 for the new springs, new U-bolts, and new bushings. $2100 with the new dual shocks, new stainless front brake lines, raised steering arm, new drop drag link, and raised steering block & studs. Prices are without shipping.
If you are interested I can tell you more about this stuff.........

Hoods69BadBowTie · 08-22-2005, 11:47 PM

I would say about 8"-10" of lift would be good. Like 6" suspension and 3" body or all suspension if thats what you want. I got 39.5's with like 9" of lift and I got room for a little bit more rubber.
-Later

formulafire99 · 08-23-2005, 01:03 AM

My 69 has 6" suspinsion and 2" body with 38.5" tires.Ihave no prblems with rubbing.

**special-K** · 08-23-2005, 09:00 AM

Big70Chevy,That`s a great deal.But,I`m not ready to make a move on this truck,yet.Just into planning and resourcing right now.Thanks for the offer.What tires are on that truck?
Everybody,this is good info.I believe I tryed a thread on 4wd/lift/tire fitment before.This is what I was after.

big70chevy · 08-23-2005, 11:08 AM

Well, if you decide you might be interested later just let me know. Those are 44 x 19.5 - 16.5 Boggers on my truck.

I you are looking for a tire fitment chart, I'm not sure I've ever seen one go back further than 1973 for Chevys.

*1FaastC10* · 08-23-2005, 08:24 PM

depends, are you going pretty? or beater? i know plenty of guys running 38s on 4-6" of lift.

**Richard** · 08-24-2005, 01:43 AM

As 2wdBlazer said kind of depends on the tire. In general I would say that most 40's are actually in the 38" range. The Hawgs, Mudders and most of the Swampers apply. I had 38" (just over 36") Hawgs on my last 72 with an 8" lift they did rub when when getting rough and I had the back of the front fenders trimmed slightly. I would say you could get away with the 10" and minor trimming as long as you dont get to rough. The 38" Fun Country's I had on my 85 were as big as 40" Hawgs. I had a 10" lift on that and they did rub, it was mostly a pavement pounder though.

Also as another poster said the wheels will make a difference. Most all off the shelf 10" to 14" wheels will have a 3.5" to 4" backspace. Going with more that a 10" wide wheel will just make the interference problem worse when the wheels are turned.

blaserman · 08-24-2005, 07:21 AM

speical-K. The kid I sold my 86 to put a set of 40's on it and took a corner to fast yesterday and rolled it. Looks like a basket case. Be carefull on how high you go. You know how the idiots in this state drive, they will cut you off in a minute.

Art

**special-K** · 08-24-2005, 08:48 AM

Just fishing now.I`m just planning on building a truck I have as a long Stepside using a set of 4.56 1 ton axles with Tru-Trac/Locker,a 6.2 or 6.5 w/turbo(built to 300+hp/www.peninsulardiesel.com),205/203 doubler.I have all this laying around.I`ll fabricate what it needs from the frame-up.I want it to be everything I always wanted in a 4wd`72.I want it to be all that and look handsome,too.My version of a hot rod.

earl87gta · 08-26-2005, 12:02 AM

Quote:

Originally Posted by special-K

Just fishing now.I`m just planning on building a truck I have as a long Stepside using a set of 4.56 1 ton axles with Tru-Trac/Locker,a 6.2 or 6.5 w/turbo(built to 300+hp/www.peninsulardiesel.com),205/203 doubler.I have all this laying around.I`ll fabricate what it needs from the frame-up.I want it to be everything I always wanted in a 4wd`72.I want it to be all that and look handsome,too.My version of a hot rod.

Im doing the same thing useing a k30 with a 6.5 in it. I plan on using a 67-72 burb body.

**JIMs70GMC** · 08-24-2005, 09:00 AM

I like the looks of the long steps myself! Get yours done and it could inspire me to get mine above it's current 3" lift w/35s.

Pont · 08-25-2005, 07:07 PM

Good advise here on wheel and tire width. The wider you go, the more lift you will need. I'm running 8" suspension lift with 35's and it's not hard to make mine rub, because of the width.

**special-K** · 08-26-2005, 08:03 AM

Earl,sounds cool.I knew there`d be more than one answer.There`s alot of variables.You`ll never get this info from a suspension company on a chart.I just put this out for some "real-life" answers and figured it can help others out before dropping a wad on incompatable combos.It would make a good "Sticky" for the 4x4 section(HINT!),eh?

08-20-2005, 10:33 PM	#1
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	How High w/40s? (`72) How much lift does it take to run 40" tires on a 67-72 truck? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 08-21-2005 at 01:58 PM.

08-20-2005, 11:48 PM	#2
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,038	At least 4.56 would be my guess. I've got 4.10's in my '69 and they seem to be correct for 35's. I had 3.73's in my first blazer with 35's and it was a bit sluggish. My '72 has stock 3.07's with 237/85/16 (about 31.5" tall) and it could probably stand to have seom 3.73's. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

08-21-2005, 12:36 PM	#4
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,038	Looks like I read it wrong... Just because I look dumb, doesn't mean I'm not! __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

08-21-2005, 02:06 PM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	That`s funny.Bouncy,thanks for answering the question I didn`t ask.I don`t think I was going to ask,but maybe you know more than me.I have CUCV axles w/4.56 gears.Mudder67,12" you think?I`ll be building a long Stepside w/doublers.I want it to be B/A,but not sure I want that much lift.I`m thinking Swampers.I`ll look at sizes,maybe go down a notch in size.Then again,that would be B / A!! __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

08-21-2005, 02:54 PM	#8
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	special K, have you considered a 52" spring swap up front? it adds lift and more flex at the same time. i recently got a pair of 52's and have been thinking about using them, but pretty much my entire truck is still in the "planning" phase. there is lots of info on CK5 about this. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

08-21-2005, 12:31 AM	#3
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Are you talking lift or gears?

08-21-2005, 01:28 PM	#5
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	LMAO......... I read it about 5 times.

08-21-2005, 01:29 PM	#6
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	I would start out guessing with a 12 inch lift.

08-21-2005, 05:24 PM	#9
GMC71k20 Registered User Join Date: Aug 2002 Location: mass Posts: 1,277	40x17 with 8. the 8" lift has settled a little bit since then. the owner of the tires used them on his truck with a 6" lift and a 3" body lift. he said it rubbed a little.

08-22-2005, 01:39 PM	#11
2wdBlazer The Blazer King Join Date: Sep 2000 Location: Valrico, Fl (Tampa) Posts: 1,212	Mine rubs with mild flexing with 9 inches. My 38's are actually 38.2. The real question is are your 40's really measuring 40. Lots of tires don't meausure up as advertised. __________________ 72 2wd Blazer. Its the superbichinest, megacoolinest, superflowinest.

08-22-2005, 01:55 PM	#12
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Get some of those michellins that are mounted on 6.5" wide rims and measure 40" tall. You could probably get by w/ 8". __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-22-2005, 11:05 PM	#13
big70chevy Tristan's monster truck!! Join Date: Jul 2004 Location: Milan, IN Posts: 87	Would you be interested in the new 12" lift I've got for sale. Will let it go for $1800 for the new springs, new U-bolts, and new bushings. $2100 with the new dual shocks, new stainless front brake lines, raised steering arm, new drop drag link, and raised steering block & studs. Prices are without shipping. If you are interested I can tell you more about this stuff......... __________________ 1970 K20, 15" lift, 44" Boggers, 14" Weld Scorpios, 5.13 gears. 1993 K1500 ext. cab Z-71 1984 GMC C30 dump

08-22-2005, 11:47 PM	#14
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	I would say about 8"-10" of lift would be good. Like 6" suspension and 3" body or all suspension if thats what you want. I got 39.5's with like 9" of lift and I got room for a little bit more rubber. -Later __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

08-23-2005, 01:03 AM	#15
formulafire99 Registered User Join Date: Aug 2005 Location: North Carolina Posts: 9	My 69 has 6" suspinsion and 2" body with 38.5" tires.Ihave no prblems with rubbing.

08-23-2005, 09:00 AM	#16
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Big70Chevy,That`s a great deal.But,I`m not ready to make a move on this truck,yet.Just into planning and resourcing right now.Thanks for the offer.What tires are on that truck? Everybody,this is good info.I believe I tryed a thread on 4wd/lift/tire fitment before.This is what I was after. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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08-23-2005, 11:08 AM	#17
big70chevy Tristan's monster truck!! Join Date: Jul 2004 Location: Milan, IN Posts: 87	Well, if you decide you might be interested later just let me know. Those are 44 x 19.5 - 16.5 Boggers on my truck. I you are looking for a tire fitment chart, I'm not sure I've ever seen one go back further than 1973 for Chevys. __________________ 1970 K20, 15" lift, 44" Boggers, 14" Weld Scorpios, 5.13 gears. 1993 K1500 ext. cab Z-71 1984 GMC C30 dump

08-23-2005, 08:24 PM	#18
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	depends, are you going pretty? or beater? i know plenty of guys running 38s on 4-6" of lift.

08-24-2005, 01:43 AM	#19
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,899	As 2wdBlazer said kind of depends on the tire. In general I would say that most 40's are actually in the 38" range. The Hawgs, Mudders and most of the Swampers apply. I had 38" (just over 36") Hawgs on my last 72 with an 8" lift they did rub when when getting rough and I had the back of the front fenders trimmed slightly. I would say you could get away with the 10" and minor trimming as long as you dont get to rough. The 38" Fun Country's I had on my 85 were as big as 40" Hawgs. I had a 10" lift on that and they did rub, it was mostly a pavement pounder though. Also as another poster said the wheels will make a difference. Most all off the shelf 10" to 14" wheels will have a 3.5" to 4" backspace. Going with more that a 10" wide wheel will just make the interference problem worse when the wheels are turned. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 08-24-2005 at 01:53 AM.

08-24-2005, 07:21 AM	#20
blaserman Senior Member Join Date: Nov 2004 Location: glen burnie md Posts: 447	speical-K. The kid I sold my 86 to put a set of 40's on it and took a corner to fast yesterday and rolled it. Looks like a basket case. Be carefull on how high you go. You know how the idiots in this state drive, they will cut you off in a minute. Art __________________ This is my best friend

08-24-2005, 08:48 AM	#21
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Just fishing now.I`m just planning on building a truck I have as a long Stepside using a set of 4.56 1 ton axles with Tru-Trac/Locker,a 6.2 or 6.5 w/turbo(built to 300+hp/www.peninsulardiesel.com),205/203 doubler.I have all this laying around.I`ll fabricate what it needs from the frame-up.I want it to be everything I always wanted in a 4wd`72.I want it to be all that and look handsome,too.My version of a hot rod. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

08-24-2005, 09:00 AM	#23
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I like the looks of the long steps myself! Get yours done and it could inspire me to get mine above it's current 3" lift w/35s. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-25-2005, 07:07 PM	#24
Pont I need another Barley Pop Join Date: Feb 2001 Location: Grants Pass, OR Posts: 1,629	Good advise here on wheel and tire width. The wider you go, the more lift you will need. I'm running 8" suspension lift with 35's and it's not hard to make mine rub, because of the width. __________________ 67 Short Fleet 4x4 04 Honda CRF450R 89 Toyota 4-Runner 34 Ford 2 door sedan - Long term project ---------------------------------------------- There is a very fine line between "hobby" and "mental illness"

08-26-2005, 08:03 AM	#25
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Earl,sounds cool.I knew there`d be more than one answer.There`s alot of variables.You`ll never get this info from a suspension company on a chart.I just put this out for some "real-life" answers and figured it can help others out before dropping a wad on incompatable combos.It would make a good "Sticky" for the 4x4 section(HINT!),eh? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

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