1-ton Longhorn vs 3/4-ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 02-14-2015, 08:54 PM

There's a thread about 1-ton Longhorns (now I kind of wish mine was one, but I'll be ok), and it made me curious about what the difference is.

My 2500 GMC (think C30 Longhorn) uses, I think, 1-ton rails, has the Dana 60, same rear suspension. The only difference I can think of would be the front control arms and spindles.

If that's the only difference, I can't imagine why they bothered to make both variants, so I must be misunderstanding something.

Can someone learn me all about this? I've been working on one for three years, you'd think I'd know!

Longhorn man?

Vintage Windmills · 02-14-2015, 09:48 PM

Springs and brakes were different. Correct on them both using 1 ton frames.

The offering of HD 3/4 and 1 tons that share the same frame isn't unusual. The 01 up 2500hd's use 1 ton frames and axles, yet they still offer a SRW 1 ton.

davepl · 02-14-2015, 10:49 PM

Thanks! Weird though. Seems odd to carry a completely different SKU (or whatever they call a model variant) just for springs and brakes and control arms.

I guess I'm more surprised they didn't just build all Longhorns that way, but they knew their business. To wit, in a '69 Impala if you had a 6-banger Biscayne you only got one upper control arm (on the rear obviously!).

Longhorn 70 · 02-14-2015, 10:57 PM

Quote:

Originally Posted by davepl

My 2500 GMC (think C30 Longhorn) uses, I think, 1-ton rails, has the Dana 60, same rear suspension. The only difference I can think of would be the front control arms and spindles.

Longhorn man?

My Longhorn C20 has an Eaton under the rear, could the Eaton vs Dana be another difference?

franken · 02-14-2015, 11:51 PM

I think 2500 in GMC-speak is 3/4 ton. 3500 is 1 ton.

**special-K** · 02-15-2015, 12:25 AM

Wouldn't all C/30 and C3500 Longhorns have HO72 rears? I've only seen Dana 60s used as 3/4t rears.

mechanicalman · 02-15-2015, 12:59 AM

Quote:

Originally Posted by Vintage Windmills

Springs and brakes were different. Correct on them both using 1 ton frames.

The offering of HD 3/4 and 1 tons that share the same frame isn't unusual. The 01 up 2500hd's use 1 ton frames and axles, yet they still offer a SRW 1 ton.

Did they make a 67-72 Suburban 30?

Did they make a 67-72 coil spring version 30 with overloads?

mechanicalman · 02-15-2015, 01:03 AM

Quote:

Originally Posted by davepl

Thanks! Weird though. Seems odd to carry a completely different SKU (or whatever they call a model variant) just for springs and brakes and control arms.

I guess I'm more surprised they didn't just build all Longhorns that way, but they knew their business. To wit, in a '69 Impala if you had a 6-banger Biscayne you only got one upper control arm (on the rear obviously!).

On the 69 Impala 6-banger Biscayne, what side did they put that single upper control arm on or did they relocate it?

**special-K** · 02-15-2015, 09:04 AM

Quote:

Originally Posted by mechanicalman

Did they make a 67-72 Suburban 30?

Did they make a 67-72 coil spring version 30 with overloads?

No and No. All 30 series had leaf spring rear. So, since all Longhorns are on C/30 frames they are all leaf spring

Longhorn 70 · 02-15-2015, 07:38 PM

Did all C30s have dual rear wheels? If so is that the rear end difference? HO52 is SRW and HO72 DRW?

71swb4x4 · 02-15-2015, 07:51 PM

Quote:

Originally Posted by Longhorn 70

Did all C30s have dual rear wheels? If so is that the rear end difference? HO52 is SRW and HO72 DRW?

No, there were single rear wheel C30's. For example, take the Longhorn, in 67-72 you couldn't have a DRW with a bed, so if there was a one-ton Longhorn, then you definitely had a SRW C30.

Vintage Windmills · 02-15-2015, 07:56 PM

Quote:

Originally Posted by Longhorn 70

Did all C30s have dual rear wheels? If so is that the rear end difference? HO52 is SRW and HO72 DRW?

It has been discussed before but I cant point to a thread. At least, the brakes are different between the HO72 and HO52. I think thats it for differences but can't confirm.

**special-K** · 02-15-2015, 09:16 PM

Brakes and bearings are different. Basically, the backing plates-out are different

1972RedNeck · 02-15-2015, 09:27 PM

Quote:

Originally Posted by special-K

Brakes and bearings are different. Basically, the backing plates-out are different

I thought there was a support bolt or something that all HO72's had in the carrier that only a few HO52's had?

02-14-2015, 08:54 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	1-ton Longhorn vs 3/4-ton There's a thread about 1-ton Longhorns (now I kind of wish mine was one, but I'll be ok), and it made me curious about what the difference is. My 2500 GMC (think C30 Longhorn) uses, I think, 1-ton rails, has the Dana 60, same rear suspension. The only difference I can think of would be the front control arms and spindles. If that's the only difference, I can't imagine why they bothered to make both variants, so I must be misunderstanding something. Can someone learn me all about this? I've been working on one for three years, you'd think I'd know! Longhorn man? __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

02-14-2015, 09:48 PM	#2
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: 1-ton Longhorn vs 3/4-ton Springs and brakes were different. Correct on them both using 1 ton frames. The offering of HD 3/4 and 1 tons that share the same frame isn't unusual. The 01 up 2500hd's use 1 ton frames and axles, yet they still offer a SRW 1 ton. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

02-14-2015, 10:49 PM	#3
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: 1-ton Longhorn vs 3/4-ton Thanks! Weird though. Seems odd to carry a completely different SKU (or whatever they call a model variant) just for springs and brakes and control arms. I guess I'm more surprised they didn't just build all Longhorns that way, but they knew their business. To wit, in a '69 Impala if you had a 6-banger Biscayne you only got one upper control arm (on the rear obviously!). __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

02-14-2015, 11:51 PM	#5
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,123	Re: 1-ton Longhorn vs 3/4-ton I think 2500 in GMC-speak is 3/4 ton. 3500 is 1 ton.

02-15-2015, 12:25 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1-ton Longhorn vs 3/4-ton Wouldn't all C/30 and C3500 Longhorns have HO72 rears? I've only seen Dana 60s used as 3/4t rears. __________________ "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 ~

02-15-2015, 07:38 PM	#10
Longhorn 70 Registered User Join Date: Dec 2012 Location: Chandler AZ Posts: 1,149	Re: 1-ton Longhorn vs 3/4-ton Did all C30s have dual rear wheels? If so is that the rear end difference? HO52 is SRW and HO72 DRW? __________________ 1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9

02-15-2015, 09:16 PM	#13
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1-ton Longhorn vs 3/4-ton Brakes and bearings are different. Basically, the backing plates-out are different __________________ "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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