High hump or low hump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bryan H · 06-12-2003, 09:03 PM

What are the advantages of a high hump cab compared to a low hump? Preference? Easier to work on the tranny? Just courious.

FRENCHBLUE72 · 06-12-2003, 09:33 PM

Easier to get to the tranny bolt's and shift linkage imo.

**JIMs70GMC** · 06-13-2003, 05:05 AM

Also the high humps are bolted in where the lowhumps are not. Well at least the high hump in my K25 is bolted in.

kaycee · 06-13-2003, 11:16 AM

if I'm wrong but I think all the trucks that had a standard tranny were high hump bolt in and the auto's were all 1 piece part of the floor board.I looked every where for a bolt in auto. hump and could not find 1.I have never seen a high hump auto. But then again there is alot of things I haven't seen yet

**CPNE** · 06-13-2003, 11:36 AM

All 4x4 trucks and all 4 speed trucks had high hump cabs. All big block equipped trucks had high humps regardless of transmission (there may be some debate here). All 3 speed manual and small block autos have low humps. Never seen an I6 auto so I don't know about them.

High humps were bolted in. The factory cut the low hump out and welded a strip of nuts on a re-envorcing strips to bolt it down. If you look at a low hump cab, there is a depression around the hump that serves as the guide to where to cut. It is very easy to make a low hump cab into a high hump one, just cut and bolt.

Not all humps are created equal. BB auto trucks have no holes in them. 4 speed 2wd trucks have one hole. Auto and 3 speed column manual 4x4 trucks have one hole. 4 speed 4x4's have 2 holes.

On 2wd trucks the location of the holes vary from engine to engine because of the placement of the engine in the engine bay. I6's set the hole further back whereas the small blocks have it moved forward somewhat. The ultra-rare 4 speed BB is different still. This is important when looking for proper boot and trim ring.

On 4x4's the transmission shfter location never changed, however the xfer case shifter location changed. In 67-69 with the rockwell xfer case the xfer case shfter hole is is LH center. In 70 the xfer case hole for the NP205 is dead center and in 71/72 the xfer case shifter hole is center RH side.

Now the only question left is "one hump of two?"

gr8scott51 · 06-13-2003, 12:47 PM

Jeff, you are a fount of knowledge. Scott

**CPNE** · 06-13-2003, 01:05 PM

Not really, I'm just full of observations I've made and things I've read and retained. Plus I have little else to do!

Longhorn Man · 06-13-2003, 09:14 PM

To throw a stick in the spokes, my 69 GMC that had a 305 V-6 and a TH400 has a stock high hump floor, while chevy fatman's 69 GMC longhorn with the 305/TH400 has the low hump.

Quote:

from some crappy country song The only thing that stays the same is that everything chainges

kaycee · 06-14-2003, 10:49 AM

MY 67 has a 305/400 with a small hump allso.

Longhorn Man · 06-15-2003, 12:34 AM

So the turd is a confused turd then huh?

06-12-2003, 09:03 PM	#1
Bryan H Registered User Join Date: Jul 2002 Location: Chesnee SC Posts: 254	High hump or low hump? What are the advantages of a high hump cab compared to a low hump? Preference? Easier to work on the tranny? Just courious.

06-12-2003, 09:33 PM	#2
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	Easier to get to the tranny bolt's and shift linkage imo. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

06-13-2003, 05:05 AM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Also the high humps are bolted in where the lowhumps are not. Well at least the high hump in my K25 is bolted in. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

06-13-2003, 11:16 AM	#4
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,453	Some1 correct me if I'm wrong but I think all the trucks that had a standard tranny were high hump bolt in and the auto's were all 1 piece part of the floor board.I looked every where for a bolt in auto. hump and could not find 1.I have never seen a high hump auto. But then again there is alot of things I haven't seen yet __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327/4L60

06-13-2003, 11:36 AM	#5
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	A humping we will go AKA the ABC's of humps All 4x4 trucks and all 4 speed trucks had high hump cabs. All big block equipped trucks had high humps regardless of transmission (there may be some debate here). All 3 speed manual and small block autos have low humps. Never seen an I6 auto so I don't know about them. High humps were bolted in. The factory cut the low hump out and welded a strip of nuts on a re-envorcing strips to bolt it down. If you look at a low hump cab, there is a depression around the hump that serves as the guide to where to cut. It is very easy to make a low hump cab into a high hump one, just cut and bolt. Not all humps are created equal. BB auto trucks have no holes in them. 4 speed 2wd trucks have one hole. Auto and 3 speed column manual 4x4 trucks have one hole. 4 speed 4x4's have 2 holes. On 2wd trucks the location of the holes vary from engine to engine because of the placement of the engine in the engine bay. I6's set the hole further back whereas the small blocks have it moved forward somewhat. The ultra-rare 4 speed BB is different still. This is important when looking for proper boot and trim ring. On 4x4's the transmission shfter location never changed, however the xfer case shifter location changed. In 67-69 with the rockwell xfer case the xfer case shfter hole is is LH center. In 70 the xfer case hole for the NP205 is dead center and in 71/72 the xfer case shifter hole is center RH side. Now the only question left is "one hump of two?" __________________ 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 Last edited by CPNE; 06-13-2003 at 11:39 AM.

06-13-2003, 12:47 PM	#6
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	wow Jeff, you are a fount of knowledge. Scott __________________ Silence is golden, duct tape is silver. - Scott

06-13-2003, 01:05 PM	#7
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Not really, I'm just full of observations I've made and things I've read and retained. Plus I have little else to do! __________________ 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

06-14-2003, 10:49 AM	#9
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,453	OH YEAH WELL MY 67 has a 305/400 with a small hump allso. __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327/4L60

06-15-2003, 12:34 AM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	So the turd is a confused turd then huh?

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