Swapping in 3/4 ton axles - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ronh72c10 · 11-11-2005, 11:47 PM

I've got a 72 3/4 ton 4x4 pickup and am thinking about swapping the axles into the 71 Jimmy.

Anybody ever try this? Is it a direct bolt in or would some fabrication be required?

Ron

67-72williso · 11-12-2005, 08:22 AM

Should bolt rite in. Your high gearing might not be as good. HO72 4.10 at best.
Later Willis

LUV2XCLR8 · 11-12-2005, 08:27 AM

Several members here have done 3/4 ton, some even 1 ton

2wdBlazer · 11-12-2005, 10:04 PM

Our years are a direct interchange. All of the 73+ fronts are direct as well. 73+ rears need the spring perches moved. I have a 73+ FF 14 bolt in mine.

ronh72c10 · 11-12-2005, 10:23 PM

Thanks! Now I just have to decide if I want to do it.

Ron

LUV2XCLR8 · 11-12-2005, 10:29 PM

Quote:

Originally Posted by ronh72c10

Thanks! Now I just have to decide if I want to do it.

Ron

BIGGER IS BETTER

ronh72c10 · 11-13-2005, 02:25 PM

Yup!

**Baketown Scotty** · 11-14-2005, 02:09 PM

Go for it. I did it, so it must be simple.

garedclay · 11-14-2005, 02:31 PM

See http://www.4wheeloffroad.com/howto/3084/

bouncytruck · 11-14-2005, 02:39 PM

IF your going to be running big tires and going off-road a lot, go for it. You may have to make a different driveline (someone correct me if I'm wrong), but everything else should be straight forward. There are a ton of guys on CK5.com running 3/4 & 1 ton gear.

sdredneck · 11-18-2005, 01:01 PM

The Brake components may also need to be changed, i.e. the Master Cylinder and the proportioning valve. There is a significant weight difference and clearance difference between a 12 bolt and a 14 bolt. If you don't care about that then you will be hard pressed to destroy the 3/4 ton equipment. I would do it if it were me.

11-11-2005, 11:47 PM	#1
ronh72c10 Senior Member Join Date: Jul 2003 Location: Mount Forest, Ontario, Canada Posts: 978	Swapping in 3/4 ton axles I've got a 72 3/4 ton 4x4 pickup and am thinking about swapping the axles into the 71 Jimmy. Anybody ever try this? Is it a direct bolt in or would some fabrication be required? Ron __________________ 72 Chevy C10 (rust repaired, starting body work) 72 GMC 3/4ton 4x4 72 Chevy C20 Suburban 38 Ford Tudor Humpback Sedan (from the darkside) 67 Pontiac Parisienne 55 Studebaker Commander 2dr Hardtop (Starliner) My Youtube channel with Video Updates!

11-12-2005, 08:22 AM	#2
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	Re: Swapping in 3/4 ton axles Should bolt rite in. Your high gearing might not be as good. HO72 4.10 at best. Later Willis __________________ Daily Driver: 1970 C-20 400 sbc,sm-465,Dana 61 one ton SRW rear, 3.07 gears, locker. There are three kinds of people: those who make things happen, those who watch things happen, and those who have no idea what happened!

11-12-2005, 08:27 AM	#3
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,475	Re: Swapping in 3/4 ton axles Several members here have done 3/4 ton, some even 1 ton __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Big Piggy: "Goliath" 07 Kodiak C4500 Lil Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

11-12-2005, 10:04 PM	#4
2wdBlazer The Blazer King Join Date: Sep 2000 Location: Valrico, Fl (Tampa) Posts: 1,213	Re: Swapping in 3/4 ton axles Our years are a direct interchange. All of the 73+ fronts are direct as well. 73+ rears need the spring perches moved. I have a 73+ FF 14 bolt in mine. __________________ 72 2wd Blazer. Its the superbichinest, megacoolinest, superflowinest.

11-12-2005, 10:23 PM	#5
ronh72c10 Senior Member Join Date: Jul 2003 Location: Mount Forest, Ontario, Canada Posts: 978	Re: Swapping in 3/4 ton axles Thanks! Now I just have to decide if I want to do it. Ron __________________ 72 Chevy C10 (rust repaired, starting body work) 72 GMC 3/4ton 4x4 72 Chevy C20 Suburban 38 Ford Tudor Humpback Sedan (from the darkside) 67 Pontiac Parisienne 55 Studebaker Commander 2dr Hardtop (Starliner) My Youtube channel with Video Updates!

11-13-2005, 02:25 PM	#7
ronh72c10 Senior Member Join Date: Jul 2003 Location: Mount Forest, Ontario, Canada Posts: 978	Re: Swapping in 3/4 ton axles Yup! __________________ 72 Chevy C10 (rust repaired, starting body work) 72 GMC 3/4ton 4x4 72 Chevy C20 Suburban 38 Ford Tudor Humpback Sedan (from the darkside) 67 Pontiac Parisienne 55 Studebaker Commander 2dr Hardtop (Starliner) My Youtube channel with Video Updates!

11-14-2005, 02:09 PM	#8
Baketown Scotty Junior Member Join Date: Oct 2005 Location: Bakersfield, CA Posts: 304	Re: Swapping in 3/4 ton axles Go for it. I did it, so it must be simple.

11-14-2005, 02:31 PM	#9
garedclay Registered User Join Date: Aug 2005 Location: Athens, GA Posts: 12	Re: Swapping in 3/4 ton axles See http://www.4wheeloffroad.com/howto/3084/ __________________ www.clayharrison.com/truck/ '72 K5 "Georgia Red" Blazer (driver and dawg hauler) '72 Cheyenne Super C20 LWB (parts and projects)

11-14-2005, 02:39 PM	#10
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	Re: Swapping in 3/4 ton axles IF your going to be running big tires and going off-road a lot, go for it. You may have to make a different driveline (someone correct me if I'm wrong), but everything else should be straight forward. There are a ton of guys on CK5.com running 3/4 & 1 ton gear. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

11-18-2005, 01:01 PM	#11
sdredneck The Crazy Kracka Join Date: Dec 2003 Location: San Diego, Ca Posts: 60	Re: Swapping in 3/4 ton axles The Brake components may also need to be changed, i.e. the Master Cylinder and the proportioning valve. There is a significant weight difference and clearance difference between a 12 bolt and a 14 bolt. If you don't care about that then you will be hard pressed to destroy the 3/4 ton equipment. I would do it if it were me. __________________ My goal in life is to be as good of a person as my dog already thinks I am. 68 GMC LWB 396 BBC Camper Special 72 Chevy Blazer 4x4 with 406 SBC 73 Dodge Dart Sport with 340



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