cab diff - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC70c20 · 05-20-2003, 05:29 PM

we are changing cabs and I need to know if there is any
differences in between a 1/2 and 3/4 ton cab, if there is what are they.

**1971Stepside** · 05-20-2003, 05:43 PM

no differences between 1/2 and 3/4 ton cabs..

*Gee_Emm* · 05-20-2003, 06:56 PM

The cab mounts on the frame are different for 3/4 tons

Gordo · 05-20-2003, 06:57 PM

Are the cabs of the same year? If not, there are diffs.

Rod · 05-20-2003, 11:04 PM

True enough there are some differnces such as small back window in 67 cab ., but big back window was an option in 67,

67-70 cab used a different type gas tank,then a 71-72 as a 71-72 cab has a vent tube in the cab for a charcoal canister under the hood.... also 71 - 72 cab has vent holes in the door frame near the vin tag. 72 cab has no raised area for the rear view mirror.

Just a few differences I've noted, there are more but these listed are easy tell tale signs of a cab swap. Mind you some cab differences were carried over into the new year production.
Rod

Roberty · 05-20-2003, 11:43 PM

I know that the big block and 4x4 trucks have the bolt in large hump floor. My friends 2wd Blazer with the factory granny geared 4 speed also has the bolt in hump. Do all the trucks with the 4 speed option have the big hump and what about the 3/4 and 1 ton trucks? All of them have the big hump floorpan?
Robert

72 CustomCamper · 05-21-2003, 01:02 AM

My 3/4 ton has the small hump... I thought it was just the 4 spd trucks...

Chuck

Dropt72Shortbed · 05-21-2003, 01:09 AM

i found another difference.

when removing my 72 cab and replacing with a 71 cab i notced the 71 cab hung down lower in those two little parts tha run down parallel to the frame rails, hard to describe what im talking about but i noticed this since the guy who installed the th350 in my truck ghetto rigged the shifter linkage, their was a bolt sticking up through the frame rail that was holding it together, on my 72 cab it cleared this bolt, on the 71 cab it did not clear.

also not sure if anyone mentioned above,

72 is first year for rear view mirror mounting on the glass

Low69CST · 05-21-2003, 06:02 PM

The firewalls are different from 67-68 to 69-72's, also 72's have the screw in the door

jayssunm · 05-21-2003, 06:39 PM

Also dont know what year they started (I have a 67 small window) but some have a cargo light (?) on the back of the cab above the rear window.

Longhorn Man · 05-21-2003, 06:50 PM

69 was the first year for the cargo light.
the high hump floors came in all 4 speed, all 4X4, all big block, and V-6 trucks, and blazer/suburbans.

Roberty · 05-21-2003, 07:05 PM

Quote:

Originally posted by longhornmail
69 was the first year for the cargo light.
the high hump floors came in all 4 speed, all 4X4, all big block, and V-6 trucks, and blazer/suburbans

The 72 2wd Blazer I just sold to a board member was a V8 turbo350 truck and it had the small hump floor. A friend of mine just bought a 2wd 72 Blazer with the granny geared 4 speed option and it has the big hump. The Blazers must have been just like the trucks as far as what transmission or if or if not it was a 4x4 as to whether it had the small hump floor or the big one.
Robert

Longhorn Man · 05-21-2003, 07:11 PM

Yeah, I ment blazers/suburbans equipped with 4X4, big block or 4 speed.
I am now wondering about the V-6 cabs having high hups though....
My 69 GMC was a 305/Th400 originally. I thas a high hump floor, and is original. (still has original paint)
There is a 69 Longhorn (GMC) with a 305 and a TH400 on e-bay right now....low hump.
Interesting.

**CPNE** · 05-21-2003, 08:57 PM

One difference not mentioned is the throttle linkage. On 71/72 cabs, it's designed for the cable linkage. On 67-70, the linkage is a rod setup. Where the bracket for the pedal bolts is different and the 71/72 cab has a hole for the cable linkage not on pre-71 cabs.

Gordo · 05-21-2003, 09:25 PM

I forget which years have what but the early models have a hand operated e-brake, later models use a foot operated e-brake.

Longhorn Man · 05-21-2003, 11:12 PM

Gordo, that would be the 67/68 that have the hand brake.

Longhorn Man · 05-21-2003, 11:13 PM

In '71 and '72, the drivers side door jamb got a black plastic vent that was not in there in 70 or earlier.

jay-dawg · 05-21-2003, 11:59 PM

could i put the hand e-brake in a foot brake cab?

Gordo · 05-22-2003, 05:02 PM

Thanks longhornmail, i figured it was somewhere around there.
jay-dawg,
I'm doing the opposite, I'm putting a foot e-brake assembly into a 68 cab. The basic thing in my way is the fuse panel and junction box. In your case it may be less trouble.

Rod · 05-22-2003, 11:34 PM

I cant see why you could not just turn the fuse panel to an upward position like the 69-72 panel... should work. but you'll have some firewall insulation issues to work at.

05-20-2003, 05:29 PM	#1
GMC70c20 Registered User Join Date: Feb 2003 Location: Iowa Posts: 974	cab diff we are changing cabs and I need to know if there is any differences in between a 1/2 and 3/4 ton cab, if there is what are they.

05-20-2003, 05:43 PM	#2
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	no differences between 1/2 and 3/4 ton cabs.. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

05-20-2003, 06:57 PM	#4
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Are the cabs of the same year? If not, there are diffs. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

05-20-2003, 11:04 PM	#5
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	True enough there are some differnces such as small back window in 67 cab ., but big back window was an option in 67, 67-70 cab used a different type gas tank,then a 71-72 as a 71-72 cab has a vent tube in the cab for a charcoal canister under the hood.... also 71 - 72 cab has vent holes in the door frame near the vin tag. 72 cab has no raised area for the rear view mirror. Just a few differences I've noted, there are more but these listed are easy tell tale signs of a cab swap. Mind you some cab differences were carried over into the new year production. Rod __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

05-20-2003, 11:43 PM	#6
Roberty Hot Damn - Here I Am!! Join Date: Feb 2000 Location: Ringgold, Georgia Posts: 726	I know that the big block and 4x4 trucks have the bolt in large hump floor. My friends 2wd Blazer with the factory granny geared 4 speed also has the bolt in hump. Do all the trucks with the 4 speed option have the big hump and what about the 3/4 and 1 ton trucks? All of them have the big hump floorpan? Robert __________________ My vehicles: '90 Silverado Sport '71 Chevelle SS Convertible '70 C-10 - My Grandfather bought it new - original un-restored

05-20-2003, 06:56 PM	#3
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 4,002	The cab mounts on the frame are different for 3/4 tons

05-21-2003, 01:02 AM	#7
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	My 3/4 ton has the small hump... I thought it was just the 4 spd trucks... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

05-21-2003, 01:09 AM	#8
Dropt72Shortbed Registered User Join Date: May 2002 Location: Huntington Beach CA Posts: 678	i found another difference. when removing my 72 cab and replacing with a 71 cab i notced the 71 cab hung down lower in those two little parts tha run down parallel to the frame rails, hard to describe what im talking about but i noticed this since the guy who installed the th350 in my truck ghetto rigged the shifter linkage, their was a bolt sticking up through the frame rail that was holding it together, on my 72 cab it cleared this bolt, on the 71 cab it did not clear. also not sure if anyone mentioned above, 72 is first year for rear view mirror mounting on the glass

05-21-2003, 06:02 PM	#9
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	The firewalls are different from 67-68 to 69-72's, also 72's have the screw in the door __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

05-21-2003, 06:39 PM	#10
jayssunm Registered User Join Date: Jan 2003 Location: San Diego, CA Posts: 98	Also dont know what year they started (I have a 67 small window) but some have a cargo light (?) on the back of the cab above the rear window. __________________ 67 Fleetside Shortie, small window, slip & slide tranny Upgrades--small block, tilt column, disc 5 lug conversion (front and rear), Future Projects--suburban gas tank under the bed, rear roll pan, better gas mileage (currently about 6-10 MPG)

05-21-2003, 06:50 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	69 was the first year for the cargo light. the high hump floors came in all 4 speed, all 4X4, all big block, and V-6 trucks, and blazer/suburbans.

05-21-2003, 07:11 PM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Yeah, I ment blazers/suburbans equipped with 4X4, big block or 4 speed. I am now wondering about the V-6 cabs having high hups though.... My 69 GMC was a 305/Th400 originally. I thas a high hump floor, and is original. (still has original paint) There is a 69 Longhorn (GMC) with a 305 and a TH400 on e-bay right now....low hump. Interesting.

05-21-2003, 08:57 PM	#14
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	One difference not mentioned is the throttle linkage. On 71/72 cabs, it's designed for the cable linkage. On 67-70, the linkage is a rod setup. Where the bracket for the pedal bolts is different and the 71/72 cab has a hole for the cable linkage not on pre-71 cabs. __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

05-21-2003, 09:25 PM	#15
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	I forget which years have what but the early models have a hand operated e-brake, later models use a foot operated e-brake. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

05-21-2003, 11:12 PM	#16
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Gordo, that would be the 67/68 that have the hand brake.



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05-21-2003, 11:13 PM	#17
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	In '71 and '72, the drivers side door jamb got a black plastic vent that was not in there in 70 or earlier.

05-21-2003, 11:59 PM	#18
jay-dawg chevelito Join Date: Jun 2001 Location: Honolulu, HI USA Posts: 1,609	could i put the hand e-brake in a foot brake cab? __________________ New deadline...when my son can drive. Aloha from Honolulu, HI

05-22-2003, 05:02 PM	#19
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Thanks longhornmail, i figured it was somewhere around there. jay-dawg, I'm doing the opposite, I'm putting a foot e-brake assembly into a 68 cab. The basic thing in my way is the fuse panel and junction box. In your case it may be less trouble. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. Last edited by Gordo; 05-23-2003 at 10:55 AM.

05-22-2003, 11:34 PM	#20
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	I cant see why you could not just turn the fuse panel to an upward position like the 69-72 panel... should work. but you'll have some firewall insulation issues to work at. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

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