Difference between 68 and 71 Frames - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dbrasco · 04-30-2009, 06:23 AM

I have swapped my cab over from a 71 frame to a 68. I have seen where some suspension parts have different part #'s between the years. I did this to go from a lwb to a swb. I still want to keep the same look with the 71 fenders/hood. Mainly I see different part #'s in the upper/lower control arms up front. Thanks

DINS 1 · 04-30-2009, 06:37 AM

The differance in parts # is going from drum brakes to disk brakes. the a arms are differant for the disk brakes. the ball joints are differant

**special-K** · 04-30-2009, 07:49 AM

The core support mounts are different.You`ll need to go with the frame year.

Dbrasco · 04-30-2009, 08:47 AM

Is there a way that I can make new mounts for the core supports and then all the fenders/etc will line up? Thanks

Longhorn Man · 04-30-2009, 12:40 PM

the 67 - 70 frame is also heavier and weaker than a 71/72 frame.

67ChevyRedneck · 04-30-2009, 01:21 PM

Quote:

Originally Posted by Longhorn Man

the 67 - 70 frame is also heavier and weaker than a 71/72 frame.

That I didn't know! Any more info on that Andy? New type of steel?

my67chevytruck · 04-30-2009, 01:36 PM

Did you also switch the suspension. I believe you could order a '68 core support mounting hardware, and install the '71 clip on the frame ( IIRC the difference is the size of the holes etc. not a different mounting point). ppl switch out front clips all the time...

Longhorn Man · 04-30-2009, 02:18 PM

yep, new steel.
GM said the old frames were not recomended to be drilled on, but the 71/72 frames you were OK to drill into. I have a dealers letter from GMC corp. stating this.

67ChevyRedneck · 04-30-2009, 02:33 PM

Quote:

Originally Posted by Longhorn Man

yep, new steel.
GM said the old frames were not recomended to be drilled on, but the 71/72 frames you were OK to drill into. I have a dealers letter from GMC corp. stating this.

WOW! Makes you think about the peeps who have the bolt on C -notch not welded in!

my67chevytruck · 04-30-2009, 02:40 PM

Dbrasco · 04-30-2009, 05:31 PM

I did transfer the front and rear suspensions over. I did have one bolt in the front that was a little off. Everything else has bolted up without a problem. As of now its a rolling chassis with the cab sitting on it. I guess as I continue on I will find out if there are any other problems. I will try ordering all new suspension for a 71. Hopefully I will not have any probelms. Thanks for all info.

Jim_PA · 05-01-2009, 01:36 AM

How much heaveier are the 67-70's? We need to know!!!

Longhorn Man · 05-01-2009, 04:44 PM

I have that book out in front of me right now, and it doesn't say how much lighter. Sorry.

04-30-2009, 06:23 AM	#1
Dbrasco Registered User Join Date: Jan 2009 Location: Murphy, Texas Posts: 55	Difference between 68 and 71 Frames I have swapped my cab over from a 71 frame to a 68. I have seen where some suspension parts have different part #'s between the years. I did this to go from a lwb to a swb. I still want to keep the same look with the 71 fenders/hood. Mainly I see different part #'s in the upper/lower control arms up front. Thanks

04-30-2009, 06:37 AM	#2
DINS 1 Registered User Join Date: Apr 2000 Location: Webster City, Iowa USA Posts: 572	Re: Difference between 68 and 71 Frames The differance in parts # is going from drum brakes to disk brakes. the a arms are differant for the disk brakes. the ball joints are differant __________________ Wade "DURAMAX BURB" Burb on 2004 chevy 2500HD 4x4 Duramax chassis Long term project 2004 2500HD 4x4 crew cab GMC Duramax 4" lift 35's 79 RS Camaro

04-30-2009, 07:49 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Difference between 68 and 71 Frames The core support mounts are different.You`ll need to go with the frame year. __________________ "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 ~

04-30-2009, 08:47 AM	#4
Dbrasco Registered User Join Date: Jan 2009 Location: Murphy, Texas Posts: 55	Re: Difference between 68 and 71 Frames Is there a way that I can make new mounts for the core supports and then all the fenders/etc will line up? Thanks

04-30-2009, 12:40 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Difference between 68 and 71 Frames the 67 - 70 frame is also heavier and weaker than a 71/72 frame.

04-30-2009, 01:36 PM	#7
my67chevytruck Under Construction Join Date: Oct 2007 Location: Midlothian,TX (DFW) Posts: 4,555	Re: Difference between 68 and 71 Frames Did you also switch the suspension. I believe you could order a '68 core support mounting hardware, and install the '71 clip on the frame ( IIRC the difference is the size of the holes etc. not a different mounting point). ppl switch out front clips all the time... __________________ Heath subscribe to the board here: http://67-72chevytrucks.com/vboard/payments.php http://67-72chevytrucks.com/vboard/s...d.php?t=157669 FAQ how to's 1956 Chevy Apache 1967 C10 SWB FleetSide (under construction) 1969 K10 SWB FleetSide (Future Build) 1972 C10 SWB Stepside (Future Build) 56 chevy truck : http://www.cardomain.com/ride/2955823/1 67 truck build: http://www.67-72chevytrucks.com/vboard/showthread.php?t=281357/1 69 k10: http://67-72chevytrucks.com/vboard/s...d.php?t=389470 Last edited by my67chevytruck; 04-30-2009 at 01:37 PM.

04-30-2009, 02:18 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Difference between 68 and 71 Frames yep, new steel. GM said the old frames were not recomended to be drilled on, but the 71/72 frames you were OK to drill into. I have a dealers letter from GMC corp. stating this.

04-30-2009, 02:40 PM	#10
my67chevytruck Under Construction Join Date: Oct 2007 Location: Midlothian,TX (DFW) Posts: 4,555	Re: Difference between 68 and 71 Frames __________________ Heath subscribe to the board here: http://67-72chevytrucks.com/vboard/payments.php http://67-72chevytrucks.com/vboard/s...d.php?t=157669 FAQ how to's 1956 Chevy Apache 1967 C10 SWB FleetSide (under construction) 1969 K10 SWB FleetSide (Future Build) 1972 C10 SWB Stepside (Future Build) 56 chevy truck : http://www.cardomain.com/ride/2955823/1 67 truck build: http://www.67-72chevytrucks.com/vboard/showthread.php?t=281357/1 69 k10: http://67-72chevytrucks.com/vboard/s...d.php?t=389470

04-30-2009, 05:31 PM	#11
Dbrasco Registered User Join Date: Jan 2009 Location: Murphy, Texas Posts: 55	Re: Difference between 68 and 71 Frames I did transfer the front and rear suspensions over. I did have one bolt in the front that was a little off. Everything else has bolted up without a problem. As of now its a rolling chassis with the cab sitting on it. I guess as I continue on I will find out if there are any other problems. I will try ordering all new suspension for a 71. Hopefully I will not have any probelms. Thanks for all info.

05-01-2009, 01:36 AM	#12
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Difference between 68 and 71 Frames How much heaveier are the 67-70's? We need to know!!!

05-01-2009, 04:44 PM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Difference between 68 and 71 Frames I have that book out in front of me right now, and it doesn't say how much lighter. Sorry.



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