What are the difference in 67-72 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

10.5stang · 09-29-2009, 08:54 PM

What is the difference in a 67 to 72 frame? Any help will be great! Thanks

Shyguy · 09-29-2009, 09:11 PM

The only thing that I know of is that the '67 frame does not have the dimple where the steering box is mounted.

The 1/2 ton and 3/4 ton frames are slightly different in the height of the rear cab mount on the frame and the 3/4 frame has extra bracing on the cross member where the trailing arms mount and usually the trailing arms are a little beefier.

Danny

Edit:

No GMC frames are not the same in most cases because most GMCs had leaf springs instead of coil springs like the Chevys, but they can be made to work.

Here are the pictures the first one is of the 67 frame with no dimple for the steering gear.

The second one is of the 68-72 frames with the dimple.

The third one is of the 1/2 ton rear cab mount.

The fourth one is of the 3/4 ton rear cab mount.

The fifth is of the 3/4 ton cross member with extra bracing.

Hope this helps.

muckyp · 09-29-2009, 09:36 PM

I recently discovered that the radiator core support frame mounts are different on the 67-68 and 69-72. The 67-68 is mounted a little higher on the frame.

Longhorn Man · 09-30-2009, 05:50 AM

and 71 and 72 are made of stronger steel than the 67-70.

**special-K** · 09-30-2009, 06:51 AM

67/68 frames have a different location for the e-brake cable.

oldcarfart · 10-01-2009, 08:56 PM

So basically I can put my '67 cab and front clip on my '73 frame??

Shyguy · 10-01-2009, 09:04 PM

I am not sure you meant "73 frame, but if you did it is possible but not real easy.

I met a guy once that put a '53 Chevy body an early '80's 4 by 4 frame. He did a good job, but said it took a while.

Danny

PowerPro · 10-01-2009, 09:18 PM

so did the 3/4 ton chevy not come with leaf springs in 70? cause I have one, it looks stock...

**special-K** · 10-02-2009, 07:09 AM

Quote:

Originally Posted by oldcarfart

So basically I can put my '67 cab and front clip on my '73 frame??

No,that`s adiferent bird all together.

Quote:

Originally Posted by PowerPro

so did the 3/4 ton chevy not come with leaf springs in 70? cause I have one, it looks stock...

Leaf rear was an option on Chevys.Coils were an option on GMCs.

CG · 10-02-2009, 09:42 AM

Never heard about the 3/4 ton cab mount being higher. Why is that and how does it not affect alignment with the box? I must be missing something very simple.

sweet70beast · 10-02-2009, 12:23 PM

I believe that the 3/4 2wd and all the 1/2 and 3/4 4x4s use the same rubber donut cab mounts. If you look at replacements from LMC etc. they list the sameones for 3/4 2wd and all 4x4s and the 1/2 2wd uses a different one. I looks to me like they are taller than the 1/2 2wd mounts. So to keep the cabs sitting in the same place in relation to the bed they had to move the frame brackets down.

Putting our cabs on newer 73 up frames can be done. I had a friend of mine do it. I think the front mounts are in the same place but the rear one on the 73s are inside the frame rails because of the gas tanks. A mount needs to be welded or bolted to the outside of the frame. If I remember right the frame sits alittle lower under the cabs on 73-87s so the frame mounts will sit alot higher on the frame.

**StingRay** · 10-02-2009, 01:24 PM

Up here in Canada coils were stock across the board Chev and GMC. Leafs were optional. Longhorns were leaf only Chev or GMC Canada and US.

I don't think the 73 frame has the same wheel base. Longer I believe. It certainly won't have the correct front frame horn for bumper mounting.

Longhorn Man · 10-02-2009, 04:37 PM

73 - 87 takes a lotta work, nothing near a bolt on.
leafs weren't always base on GMC in the states either.

Shyguy · 10-02-2009, 06:07 PM

I was told that the reason for the larger rubber bushings on the rear cab mounts for 3/4 ton and all 4X4's was to give more cushion and a smoother ride in the cab.

Sounds logical since the suspension on them were heavier duty than on 2 wd 1/2 tons.

Danny

sweet70beast · 10-03-2009, 01:59 AM

I personally have never seen a GMC with coil springs and have only seen 2 Chevys with leafs. I can't imagine there is/was alot of them cross ordered.

Longhorn Man · 10-03-2009, 02:46 AM

and I've personally seen more GMCs with coils verses leafs.

oldcarfart · 10-03-2009, 09:36 AM

Being a production frame is the frame common between Chevy and GMC, i.e. drilled for both leafs and coils so changing would be easy enough? IIRC the front crossmembers lack only one or two holes when they are swapped. I will probably keep coils in the rear of my '67 for ease of dropping 4" and with the '73 front clip am shopping for dropped spindles at 2.5". Inputs? Comments? I am open to suggestions (be nice <grin>!!).

09-29-2009, 08:54 PM	#1
10.5stang Registered User Join Date: Jan 2007 Location: Goldsby,OK Posts: 324	What are the difference in 67-72 What is the difference in a 67 to 72 frame? Any help will be great! Thanks __________________ 67 SWB in the works........ still working! 72 GMC SWB bought finished from original owner. 71 Chevrolet SWB Last edited by 10.5stang; 09-29-2009 at 08:58 PM.

09-29-2009, 09:11 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: What are the difference in 67-72 The only thing that I know of is that the '67 frame does not have the dimple where the steering box is mounted. The 1/2 ton and 3/4 ton frames are slightly different in the height of the rear cab mount on the frame and the 3/4 frame has extra bracing on the cross member where the trailing arms mount and usually the trailing arms are a little beefier. Danny Edit: No GMC frames are not the same in most cases because most GMCs had leaf springs instead of coil springs like the Chevys, but they can be made to work. Here are the pictures the first one is of the 67 frame with no dimple for the steering gear. The second one is of the 68-72 frames with the dimple. The third one is of the 1/2 ton rear cab mount. The fourth one is of the 3/4 ton rear cab mount. The fifth is of the 3/4 ton cross member with extra bracing. Hope this helps. Attached Images __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. Last edited by Shyguy; 09-30-2009 at 10:15 AM. Reason: To Add Some Pictures

09-29-2009, 09:36 PM	#3
muckyp Registered User Join Date: Mar 2001 Location: Forney, Texas Posts: 290	Re: What are the difference in 67-72 I recently discovered that the radiator core support frame mounts are different on the 67-68 and 69-72. The 67-68 is mounted a little higher on the frame.

09-30-2009, 05:50 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What are the difference in 67-72 and 71 and 72 are made of stronger steel than the 67-70.

09-30-2009, 06:51 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: What are the difference in 67-72 67/68 frames have a different location for the e-brake cable. __________________ "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 ~

10-01-2009, 08:56 PM	#6
oldcarfart Registered User Join Date: Aug 2009 Location: Clinton, SC Posts: 59	Re: What are the difference in 67-72 So basically I can put my '67 cab and front clip on my '73 frame??

10-01-2009, 09:04 PM	#7
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: What are the difference in 67-72 I am not sure you meant "73 frame, but if you did it is possible but not real easy. I met a guy once that put a '53 Chevy body an early '80's 4 by 4 frame. He did a good job, but said it took a while. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

10-01-2009, 09:18 PM	#8
PowerPro Registered User Join Date: Sep 2009 Location: Spokane, WA Posts: 68	Re: What are the difference in 67-72 so did the 3/4 ton chevy not come with leaf springs in 70? cause I have one, it looks stock... __________________ 1970 C20 LWB Fleetside with a 472 Caddy engine! TH400 Restoration in progress 07 Yamaha 650 V-Star Custom 83 Honda V-45 Magna

10-02-2009, 09:42 AM	#10
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 19,791	Re: What are the difference in 67-72 Never heard about the 3/4 ton cab mount being higher. Why is that and how does it not affect alignment with the box? I must be missing something very simple.

10-02-2009, 12:23 PM	#11
sweet70beast Registered User Join Date: Sep 2006 Location: Shelley Idaho Posts: 876	Re: What are the difference in 67-72 I believe that the 3/4 2wd and all the 1/2 and 3/4 4x4s use the same rubber donut cab mounts. If you look at replacements from LMC etc. they list the sameones for 3/4 2wd and all 4x4s and the 1/2 2wd uses a different one. I looks to me like they are taller than the 1/2 2wd mounts. So to keep the cabs sitting in the same place in relation to the bed they had to move the frame brackets down. Putting our cabs on newer 73 up frames can be done. I had a friend of mine do it. I think the front mounts are in the same place but the rear one on the 73s are inside the frame rails because of the gas tanks. A mount needs to be welded or bolted to the outside of the frame. If I remember right the frame sits alittle lower under the cabs on 73-87s so the frame mounts will sit alot higher on the frame. __________________ 1970 Nova 327/T5 (my 1st car) 1971 K-20 350/350/205 (winter DD) 1953 GMC Suburban 1968 Chevy Bel Air 1976 Chev C-10 1972 Skylark (suncoupe) 1 of 3943 made Last edited by sweet70beast; 10-02-2009 at 12:33 PM.

10-02-2009, 01:24 PM	#12
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Re: What are the difference in 67-72 Up here in Canada coils were stock across the board Chev and GMC. Leafs were optional. Longhorns were leaf only Chev or GMC Canada and US. I don't think the 73 frame has the same wheel base. Longer I believe. It certainly won't have the correct front frame horn for bumper mounting. __________________ Saskatoon, Saskatchewan Canada Last edited by StingRay; 10-02-2009 at 01:26 PM.

10-02-2009, 04:37 PM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What are the difference in 67-72 73 - 87 takes a lotta work, nothing near a bolt on. leafs weren't always base on GMC in the states either.

10-02-2009, 06:07 PM	#14
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: What are the difference in 67-72 I was told that the reason for the larger rubber bushings on the rear cab mounts for 3/4 ton and all 4X4's was to give more cushion and a smoother ride in the cab. Sounds logical since the suspension on them were heavier duty than on 2 wd 1/2 tons. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

10-03-2009, 01:59 AM	#15
sweet70beast Registered User Join Date: Sep 2006 Location: Shelley Idaho Posts: 876	Re: What are the difference in 67-72 I personally have never seen a GMC with coil springs and have only seen 2 Chevys with leafs. I can't imagine there is/was alot of them cross ordered. __________________ 1970 Nova 327/T5 (my 1st car) 1971 K-20 350/350/205 (winter DD) 1953 GMC Suburban 1968 Chevy Bel Air 1976 Chev C-10 1972 Skylark (suncoupe) 1 of 3943 made Last edited by sweet70beast; 10-03-2009 at 01:59 AM.

10-03-2009, 02:46 AM	#16
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What are the difference in 67-72 and I've personally seen more GMCs with coils verses leafs.



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10-03-2009, 09:36 AM	#17
oldcarfart Registered User Join Date: Aug 2009 Location: Clinton, SC Posts: 59	Re: What are the difference in 67-72 Being a production frame is the frame common between Chevy and GMC, i.e. drilled for both leafs and coils so changing would be easy enough? IIRC the front crossmembers lack only one or two holes when they are swapped. I will probably keep coils in the rear of my '67 for ease of dropping 4" and with the '73 front clip am shopping for dropped spindles at 2.5". Inputs? Comments? I am open to suggestions (be nice <grin>!!).

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