4x4 1/2 ton to 3/4 ton axles - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smashingchuck · 07-21-2010, 08:48 PM

My buddy has a truck that is suppsoedly a 3/4 ton, that some one has put 1/2 ton axles under. How can we verify that it is a 3/4 ton frame and springs, and what would we need to do to go back to 3/4 ton axles?

thanks.

**Captainfab** · 07-22-2010, 01:05 AM

One thing that comes to mind is in my experience the 3/4 tons typically had 56" rear springs. The front springs might have had 3 leafs instead of 2. The only thing that I can think of needing to be changed besides the differentials, is the rear driveshaft.....bigger u-joints on the 14 bolt.

68 TT · 07-22-2010, 09:09 AM

The thickness of the metal on the frame rails is different between 1/2 and 3/4 tons. Can't remember the numbers off the top of my head but there were some threads about it not long ago so a quick search for frame thickness might show them.

If you can't find it I will mic the two I have and give you the numbers when I get home.

smashingchuck · 07-23-2010, 07:36 PM

And for the front you can just change out the outers?

07-21-2010, 08:48 PM	#1
smashingchuck It'd be alot cooler if you did Join Date: May 2003 Location: Three Rivers, MI Posts: 2,345	4x4 1/2 ton to 3/4 ton axles My buddy has a truck that is suppsoedly a 3/4 ton, that some one has put 1/2 ton axles under. How can we verify that it is a 3/4 ton frame and springs, and what would we need to do to go back to 3/4 ton axles? thanks. __________________ 78 Build Thread 4Runner Build

07-22-2010, 01:05 AM	#2
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: 4x4 1/2 ton to 3/4 ton axles One thing that comes to mind is in my experience the 3/4 tons typically had 56" rear springs. The front springs might have had 3 leafs instead of 2. The only thing that I can think of needing to be changed besides the differentials, is the rear driveshaft.....bigger u-joints on the 14 bolt. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-22-2010, 09:09 AM	#3
68 TT Still plays with trucks Join Date: Jul 2009 Location: Spokane, WA Posts: 3,556	Re: 4x4 1/2 ton to 3/4 ton axles The thickness of the metal on the frame rails is different between 1/2 and 3/4 tons. Can't remember the numbers off the top of my head but there were some threads about it not long ago so a quick search for frame thickness might show them. If you can't find it I will mic the two I have and give you the numbers when I get home. __________________ miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars

07-23-2010, 07:36 PM	#4
smashingchuck It'd be alot cooler if you did Join Date: May 2003 Location: Three Rivers, MI Posts: 2,345	Re: 4x4 1/2 ton to 3/4 ton axles And for the front you can just change out the outers? __________________ 78 Build Thread 4Runner Build

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