1/2 ton to 3/4 ton running gear - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Back row pupil · 01-30-2015, 10:10 PM

I need advice on choosing the right year of 3 / 4 ton running gear, to put under my '72 short box. I want a relatively easy transition. Plus I am looking to disc brake the rear! Looking to run the new 37's or old school 38's. Budget is not Substantial!

GASoline71 · 01-30-2015, 10:46 PM

Lol...

Gary

**special-K** · 01-30-2015, 11:56 PM

Either bolt-in a 67-72 HO52 or Dana60, or a 14-bolt just needs reconfigured mounts

**argonaut** · 01-31-2015, 12:30 AM

Find a 73 to 87 3/4 ton truck and pull the axles. The front will bolt right in. Reposition the rear axle spring perches and it will bolt in. You'll have to upgrade the rear axle to run larger ujoints or they also make a conversion ujoint but it won't be as strong. You'll have to adjust the shock mounts too.
but the axles should be cheap. I wouldn't pay more than 500 for a set in good condition.

andrewmp6 · 01-31-2015, 03:46 AM

With 38s you want 1 ton axles,The 3/4 ton will break over time if you push it hard enough.

01-30-2015, 10:10 PM	#1
Back row pupil Registered User Join Date: Jan 2015 Location: walla Walla wa Posts: 11	1/2 ton to 3/4 ton running gear I need advice on choosing the right year of 3 / 4 ton running gear, to put under my '72 short box. I want a relatively easy transition. Plus I am looking to disc brake the rear! Looking to run the new 37's or old school 38's. Budget is not Substantial!

01-30-2015, 11:56 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1/2 ton to 3/4 ton running gear Either bolt-in a 67-72 HO52 or Dana60, or a 14-bolt just needs reconfigured mounts __________________ "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 ~

01-31-2015, 12:30 AM	#4
argonaut Senior Member Join Date: Aug 2008 Location: Long Beach, CA Posts: 1,813	Re: 1/2 ton to 3/4 ton running gear Find a 73 to 87 3/4 ton truck and pull the axles. The front will bolt right in. Reposition the rear axle spring perches and it will bolt in. You'll have to upgrade the rear axle to run larger ujoints or they also make a conversion ujoint but it won't be as strong. You'll have to adjust the shock mounts too. but the axles should be cheap. I wouldn't pay more than 500 for a set in good condition. __________________ Jason M. @argonaut62 1972 K5 Blazer CST, Turquoise 1966 K20 Short Fleet Pickup, Big Ugly 1964 C10 Short Fleet, Gertrude 2001 Porsche 911 Carrera 1996 Ford Bronco XLT 1980 Jeep Wagoneer 2008 Honda CBR1000RR 2005 Honda RC51 1981 Honda CB750C No dis-assemble Johnny Five! No dis-assemble!

01-31-2015, 03:46 AM	#5
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: 1/2 ton to 3/4 ton running gear With 38s you want 1 ton axles,The 3/4 ton will break over time if you push it hard enough.



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