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#1 |
Registered User
![]() Join Date: Jan 2005
Location: Eastern Nebraska
Posts: 611
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Biggest tires on my 72, K-20?
She's running 265's right now and looking like 285's will fit with no problem (16" rims). How much larger can I go without getting in to a lift or any body mods (cutting sheet metal)?
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'72 Chevy K-20 Crate 350, SM465, 4.10's |
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#2 |
Registered User
![]() Join Date: Dec 2004
Location: Gypsum Kansas 67448
Posts: 1,681
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You Might Be Able To Fit A 305/70r16,they Are About The Same As 33's And They Usually Fit
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21 2500hd duramax 58 apache HILLJOB GRAPHIX--for all your graphic needs My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=542497 LS ENGINE SWAP INFORMATION THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=377348 4l60 to an NP205 http://67-72chevytrucks.com/vboard/s...43#post3697343 |
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#3 | |
1970 K10, 350, 4spd!
Join Date: Jun 2004
Location: Shawnee, Ok
Posts: 128
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#4 |
user # 2756
![]() Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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I'd agree what hurts is the width of the rim. If you can stay with an 7-8" rim you should have no problems with a 33" tire. meaning a 33-9.5 on 7" rim or as wide as a 33-12.5 on an 8" wide rim.
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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 ![]() Last edited by JIMs70GMC; 08-25-2005 at 09:32 PM. |
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#5 |
4 eyed fever
Join Date: Jul 2005
Location: Eureka, Nevada
Posts: 500
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I wouldn't put the 305/70/16's (same as a 33/12.50/16), on without a lift unless you don't plan on doing much wheeling. You won't have much clearance when turning and if you hit much of a bump at the same time they will hit the wheel wells. My .02
Al
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1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!! |
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#6 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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I have 285/75 Swampers on 8" rims on a truck that sits up a bit.Either add-a-leafs or spring shop job.These tires are nubby on the side and they`ll rub (no damage) a bit in certain turns like going into an uphill driveway.But,the shocks are way past shot.They are just things with bolts at each end.I have a lift/shocks to go on it.
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"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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#7 |
Senior Member
Join Date: Dec 2003
Location: Kingsport TN
Posts: 4,641
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I would get a set of ord zero rates they will give you 1in of lift and then run the 33 12.50. if they still end up a little to big never know how much your springs have sedled you can get exstended spring shackles for the front that will give you a little more lift and use an air shock in the rear or mabe a helper spring.
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Earl 68 2500 4x4 GMC Burb |
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#8 |
Registered User
![]() Join Date: Feb 2003
Location: Staunton, Virginia
Posts: 554
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I've been looking for the same answer. I have a 72 Cheyenne 3/4 ton 4x4 that has 305/70/16's on it now, but has a 4" lift right now, I hope it won't rub when I take the lift out, I think the 3/4 spring will keep it high enough. I also have a 72 CST Blazer that I just got factory rally's for (15x8's). I think I'm going to run 32/11.50's on them. I shouldn't have to worry about rubbing.
Scott |
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