Cab Floor Hump - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bossrod · 02-28-2005, 10:49 AM

Is there a way to determine if you have a high or low hump?

NPilot1975 · 02-28-2005, 11:25 AM

If the floor is almost flat in the middle, you have a low hump.

*Randy70C-10* · 02-28-2005, 11:25 AM

High hump is removeable (bolts on)...low hump is not.

1971ChevyTruck · 02-28-2005, 12:31 PM

How hard is it to convert to a high hump???

*Randy70C-10* · 02-28-2005, 02:51 PM

It would be easy for me to do, it all depends on your skill level. (the reason I say this is because I've met people that can't gap a spark plug)

If you can cut and weld metal then it would be a piece of cake.

silvertonguedevil · 02-28-2005, 03:13 PM

Not trying to hijack here but....Would a '72 3/4 ton 2wd with a 402/T400 combo have a low hump or high? What had 'em and what didn't?

*Randy70C-10* · 02-28-2005, 03:22 PM

That should have been a high hump, I'm pretty sure that all big block trucks had high humps.

avejoe · 02-28-2005, 03:42 PM

No need to weld if going from low to high hump.

silvertonguedevil · 02-28-2005, 03:49 PM

Just need to cut?

*Randy70C-10* · 02-28-2005, 04:00 PM

You cold probably just cut and bolt the high hump on, you just wouldn't have the lip around the hole that the hump sits in. I have a high hump truck in my back yard (with two other trucks), ya want pics? (I have a digicam)

silvertonguedevil · 02-28-2005, 04:05 PM

This is what I'm up to....I found a '72 3/4 ton 2wd with a big block and I'm thinkin' about buying it and taking out the big block and trans and putting it into my '72 which was originally a 1/2 ton 2wd with a 350/T350. What I'm wondering is if I will need to make my current pickup a high-hump cab so that it will fit or not. What would be right? How would a '72 1/2 ton 2wd with a 402/T400 come from the factory? High or low?

70short · 02-28-2005, 04:14 PM

I want the low hump in my truck. I have A high hump that I could trade it has A hole in the center for A manual tranGary

*Randy70C-10* · 02-28-2005, 04:25 PM

Here's a high hump.... http://67-72chevytrucks.com/vboard/s....php3?t=143360

J Y Dog · 02-28-2005, 04:44 PM

I've gotta 72 GMC 402 3 on the tree it's low hump.

J Y

Tx Firefighter · 02-28-2005, 05:08 PM

Even though all factory big block auto trucks were high hump, it will fit under a low hump too.

When I converted my 70 from 6 cylinder 3 speed to 454, turbo 400, it all fit under the low hump without problems. Initially, it was snug in some areas, but when I replaced the old original cab mounts with new ones, it raised the cab near and inch, then it all cleared by a mile.

70short · 02-28-2005, 05:12 PM

raised an inch cleared by A mile hummmmmmmmmm!!!!

Gary

XXL · 02-28-2005, 05:56 PM

Quote:

Originally Posted by silvertonguedevil

Just need to cut?

Cut, drill, bolt.

BTW... I'm ASSuming the stock high hump uses body bolts. So does that mean the cab floor has welded nuts to back up the bolts? Or is it just sheetmetal threaded? Or??

*Randy70C-10* · 02-28-2005, 07:34 PM

The floor has nuts welded underneath and uses body bolts.

silvertonguedevil · 02-28-2005, 07:43 PM

Sounds like a pain in the a$$!

*Randy70C-10* · 02-28-2005, 08:26 PM

They are very easy to remove and install in the trucks that originally came with it. If I was going to install one on a low-hump truck, I'd set it in place, mark the holes with a sharpie marker and drill, put bolts through the drilled holes with a nut on the other side, crawl under the truck and weld them in place. It really shouldn't be too hard at all if you have a welder. A cheap wire feed flux-core welder would do the job.

silvertonguedevil · 02-28-2005, 08:39 PM

I guess that doesn't sound too bad. Thanks Randy!

saxmo · 02-28-2005, 09:01 PM

Quote:

Originally Posted by 70short

raised an inch cleared by A mile hummmmmmmmmm!!!!

Gary

You know we (Texans) are creative when it comes to measurin' and cipherin'

GMC Jim · 03-01-2005, 06:40 AM

My '71 GMC; 402 with 400 trans...has a low hump

silvertonguedevil · 03-01-2005, 10:31 AM

Jim, is that an original 402 truck?

**Yukon Jack** · 03-01-2005, 10:38 AM

For further reference, here is a high hump and a low hump.

02-28-2005, 10:49 AM	#1
bossrod Registered User Join Date: Feb 2004 Location: Groton, CT Posts: 168	Cab Floor Hump Is there a way to determine if you have a high or low hump?

02-28-2005, 11:25 AM	#2
NPilot1975 Senior Member Join Date: Aug 2002 Location: Plymouth, MA Posts: 891	If the floor is almost flat in the middle, you have a low hump. __________________ 1972 Blazer body...need to get a thread started for the rest of the story

02-28-2005, 03:13 PM	#6
silvertonguedevil Senior Member Join Date: May 2004 Location: Seaside, Oregon Posts: 1,789	Not trying to hijack here but....Would a '72 3/4 ton 2wd with a 402/T400 combo have a low hump or high? What had 'em and what didn't? __________________ -Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4

02-28-2005, 03:42 PM	#8
avejoe Custer had a plan too. Join Date: Dec 2003 Location: No. California Posts: 344	No need to weld if going from low to high hump. __________________ 72 K15 GMC (aka Big White) Performance Rockers, Cab Corners, and Floors Fossil Fuel Glutton Neighborhood Nuisance 98 BMW 540i for Speed (Sold ) 05 Subaru Outback for mileage

02-28-2005, 03:49 PM	#9
silvertonguedevil Senior Member Join Date: May 2004 Location: Seaside, Oregon Posts: 1,789	Just need to cut? __________________ -Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4

02-28-2005, 11:25 AM	#3
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	High hump is removeable (bolts on)...low hump is not.

02-28-2005, 12:31 PM	#4
1971ChevyTruck Registered User Join Date: Jan 2005 Location: Illinois Posts: 1,006	How hard is it to convert to a high hump???

02-28-2005, 02:51 PM	#5
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	It would be easy for me to do, it all depends on your skill level. (the reason I say this is because I've met people that can't gap a spark plug) If you can cut and weld metal then it would be a piece of cake.

02-28-2005, 03:22 PM	#7
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	That should have been a high hump, I'm pretty sure that all big block trucks had high humps.

02-28-2005, 04:00 PM	#10
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	You cold probably just cut and bolt the high hump on, you just wouldn't have the lip around the hole that the hump sits in. I have a high hump truck in my back yard (with two other trucks), ya want pics? (I have a digicam)

02-28-2005, 04:05 PM	#11
silvertonguedevil Senior Member Join Date: May 2004 Location: Seaside, Oregon Posts: 1,789	This is what I'm up to....I found a '72 3/4 ton 2wd with a big block and I'm thinkin' about buying it and taking out the big block and trans and putting it into my '72 which was originally a 1/2 ton 2wd with a 350/T350. What I'm wondering is if I will need to make my current pickup a high-hump cab so that it will fit or not. What would be right? How would a '72 1/2 ton 2wd with a 402/T400 come from the factory? High or low? __________________ -Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4

02-28-2005, 04:14 PM	#12
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	I want the low hump in my truck. I have A high hump that I could trade it has A hole in the center for A manual tranGary __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"

02-28-2005, 04:25 PM	#13
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Here's a high hump.... http://67-72chevytrucks.com/vboard/s....php3?t=143360

02-28-2005, 04:44 PM	#14
J Y Dog Registered User Join Date: Jun 2002 Location: asheville, NC Posts: 63	I've gotta 72 GMC 402 3 on the tree it's low hump. J Y

02-28-2005, 05:08 PM	#15
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Even though all factory big block auto trucks were high hump, it will fit under a low hump too. When I converted my 70 from 6 cylinder 3 speed to 454, turbo 400, it all fit under the low hump without problems. Initially, it was snug in some areas, but when I replaced the old original cab mounts with new ones, it raised the cab near and inch, then it all cleared by a mile. __________________ I'm on the Instagram- @Gearhead_Kevin



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02-28-2005, 05:12 PM	#16
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	raised an inch cleared by A mile hummmmmmmmmm!!!! Gary __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"

02-28-2005, 07:34 PM	#18
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	The floor has nuts welded underneath and uses body bolts.

02-28-2005, 07:43 PM	#19
silvertonguedevil Senior Member Join Date: May 2004 Location: Seaside, Oregon Posts: 1,789	Sounds like a pain in the a$$! __________________ -Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4

02-28-2005, 08:26 PM	#20
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	They are very easy to remove and install in the trucks that originally came with it. If I was going to install one on a low-hump truck, I'd set it in place, mark the holes with a sharpie marker and drill, put bolts through the drilled holes with a nut on the other side, crawl under the truck and weld them in place. It really shouldn't be too hard at all if you have a welder. A cheap wire feed flux-core welder would do the job.

02-28-2005, 08:39 PM	#21
silvertonguedevil Senior Member Join Date: May 2004 Location: Seaside, Oregon Posts: 1,789	I guess that doesn't sound too bad. Thanks Randy! __________________ -Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4

03-01-2005, 06:40 AM	#23
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	My '71 GMC; 402 with 400 trans...has a low hump __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).

03-01-2005, 10:31 AM	#24
silvertonguedevil Senior Member Join Date: May 2004 Location: Seaside, Oregon Posts: 1,789	Jim, is that an original 402 truck? __________________ -Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4

03-01-2005, 10:38 AM	#25
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	For further reference, here is a high hump and a low hump. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

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