1 ton rearend swap options?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chucks70 · 01-06-2009, 05:48 PM

I have an Eaton HO72 with 4:10 gears. The truck is a dually with a flat bed. I intend on putting a Caddy engine in and want something with more highway friendly gears. Possibly in the range around 3:50 to 3:73 with a posi. I believe 14 bolt rears up until '86 or so are a direct bolt in, is this correct? Does it have to be off a dually truck or can it be a single wheel one ton. (is there a difference). Will newer rears fit? I could move spring mounts. Are they available with disc brakes? Any info or input would help.

chucks70 · 01-07-2009, 09:24 PM

anybody?

71swb4x4 · 01-07-2009, 09:58 PM

I believe 73 and up dually rears are wider. I am not certain on that. That's about all I have to help.

**special-K** · 01-07-2009, 10:02 PM

Well...the 14-bolts started in`73 and that`s when the shocks started going one forward and one back.And,the spring pads are farther apart.Both easy fixes.The dual "pickup" rears are wide like a single pickup rear.The axles themselves iarethe same,just different lug studs,etc,for the dual wheels.A cab`n`chassis 14-bolt will be narrow.

Tx Firefighter · 01-07-2009, 10:53 PM

I've got a 79 model cab and chassis 14 bolt rearend in my shop right now.

The spring pads are 40 inches apart, center to center.

67_C-30 · 01-07-2009, 11:09 PM

Quote:

Originally Posted by special-K

The dual "pickup" rears are wide like a single pickup rear.The axles themselves iarethe same,just different lug studs,etc,for the dual wheels.A cab`n`chassis 14-bolt will be narrow.

There's actually 3 different widths,Tim. The dually pickup rearends are even wider than a 3/4 ton or 1 ton SRW trucks. If you put dually rims on a SRW rearend they will hit the wheel tubs. The cab and chassis rearends are actually closer to the width of the SRW axles, but are a little narrower. The dually pickup rearends are way wider than both. I found this out when I built my dually. I used a dually pickup rearend out of a '97 C3500, but I had to move the spring and shock perches. As you can see in the first pic below, the hub sticks out past the bed side on the dually pickup axle. If put a SRW rim on it, the tire would stick out the wheelwell. I almost didn't put the dual wheel flares on it and left it like the bottom two pics. It looked like a railroad truck with just the inner dually wheels on it!

01-06-2009, 05:48 PM	#1
chucks70 Registered User Join Date: Feb 2002 Location: Cadiz, OH Posts: 628	1 ton rearend swap options?? I have an Eaton HO72 with 4:10 gears. The truck is a dually with a flat bed. I intend on putting a Caddy engine in and want something with more highway friendly gears. Possibly in the range around 3:50 to 3:73 with a posi. I believe 14 bolt rears up until '86 or so are a direct bolt in, is this correct? Does it have to be off a dually truck or can it be a single wheel one ton. (is there a difference). Will newer rears fit? I could move spring mounts. Are they available with disc brakes? Any info or input would help. __________________ 68 1 ton dually 292, 2001 Sebring, 2004 Trailblazer, 11 Camaro Convertible.

01-07-2009, 09:24 PM	#2
chucks70 Registered User Join Date: Feb 2002 Location: Cadiz, OH Posts: 628	Re: 1 ton rearend swap options?? anybody? __________________ 68 1 ton dually 292, 2001 Sebring, 2004 Trailblazer, 11 Camaro Convertible.

01-07-2009, 09:58 PM	#3
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: 1 ton rearend swap options?? I believe 73 and up dually rears are wider. I am not certain on that. That's about all I have to help. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

01-07-2009, 10:02 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1 ton rearend swap options?? Well...the 14-bolts started in`73 and that`s when the shocks started going one forward and one back.And,the spring pads are farther apart.Both easy fixes.The dual "pickup" rears are wide like a single pickup rear.The axles themselves iarethe same,just different lug studs,etc,for the dual wheels.A cab`n`chassis 14-bolt will be narrow. __________________ "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; 01-07-2009 at 10:05 PM.

01-07-2009, 10:53 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: 1 ton rearend swap options?? I've got a 79 model cab and chassis 14 bolt rearend in my shop right now. The spring pads are 40 inches apart, center to center. __________________ I'm on the Instagram- @Gearhead_Kevin

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