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#1 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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big block vs tunnel hump...
Are all big block trucks big hump?
Are all 4x4s big hump? Are all 2WD non-big block small hump? Thanks! |
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#2 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: big block vs tunnel hump...
Two wheel drives with either the SM-420 or SM-465 4 speed transmission have the high humps.
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'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. |
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#3 |
Senior Member
Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,497
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Re: big block vs tunnel hump...
And maybe 2wd with the TH400?? I am not sure on that one.
I think there have been some big blocks on here with small humps, but it is generally accepted that all were supposed to be high humps. All 4x4's were high humps.
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Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs. |
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#4 |
Registered User
![]() Join Date: Oct 2010
Location: Buckeye Arizona
Posts: 470
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Re: big block vs tunnel hump...
My 327 Turbo 400 truck has a small hump.
You can fit a 400 with a BBC under a small too. |
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#5 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: big block vs tunnel hump...
71swb4x4 -i had the same wonder - i.e. if the hump was for the TH400 of for the BB itself. Apparently it's for the engine, but not sure why - since it will fit the bb/th400 combo under a small hump apparently. Interesting. I'll "bet" it was because of the th400, even though it fits. Can't imagine what the engine would have to do with the hump unless it somehow dragged the trans a little higher with it.
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#6 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,737
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Re: big block vs tunnel hump...
I had a big block cheyenne 3 on the tree with a low hump...
And all 4x4 should be high hump.
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#7 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: big block vs tunnel hump...
I've had small block/TH400 trucks with small hump. I've had big block/3spd trucks and don't recall how they were,but I believe they were small hump. I think it was about extra cooling/air space for the big block/TH400 more than fit.
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"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 ~ |
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#8 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: big block vs tunnel hump...
very interesting. lookin at a truck with 402/th400 and didn't notice - but when checked the catalog for carpets later, noticed that all bb trucks would get a high hump carpet if order per the catalog (which of course doesn't mean they know what they're talking about). Bottom line, get the truck, see the hump, then order...
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#9 |
Registered User
![]() Join Date: Oct 2006
Location: Southern Kalifornia
Posts: 3,066
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Re: big block vs tunnel hump...
I had a 1972 C20 with a big block/Th400 and small hump.
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#10 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,737
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Re: big block vs tunnel hump...
Every 71-72 with a big block/400 combo i have seen was high hump. Was the truck original?
__________________
67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#11 |
Registered User
![]() Join Date: Oct 2006
Location: Southern Kalifornia
Posts: 3,066
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Re: big block vs tunnel hump...
The spid said it came with a 402(400) and the TH400. and the vins matched.
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------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT |
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#12 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: big block vs tunnel hump...
I had a 69 that was a factory bb and th400 c20 that was a small hump, my 68 1/2 ton is th400 with low tunnel,my 1/2 ton 70 and 71 bb trucks are th400 and high humps.
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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#13 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: big block vs tunnel hump...
i believe that the big hump was for the old four speed trans only, the shorter hump was for everything else...
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#14 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: big block vs tunnel hump...
I would have assumed the same - but for SOME reason - LMC lists their carpets for all 4x4s and big blocks as high hump. This has turned into a very interesting thread - plenty of proof out there from y'all that proves it really could come either way with a big block and/or a TH400. The 4-speed theory makes sense, but is also disproven by all the folks out there with original big blocks and th400s that have a big hump. Apparently, there's no rhyme or reason! Thanks for posting guys.
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#15 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: big block vs tunnel hump...
LMC is not a good reference. They should simply list the carpet for high hump or low hump like everyone else does.One more thing to prove they are not GM Truck guys. Through the years engines,transmissions,and cabs have been swapped. C-series bodies have been put on 4wd frames,too. Just go by what you have NOW.
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"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 ~ Last edited by special-K; 05-30-2012 at 07:09 AM. |
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#16 |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: big block vs tunnel hump...
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#17 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,270
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Re: big block vs tunnel hump...
My 68 GMC came with the high hump it has and alawys had a t400. I also belive it to be a big block truck but for now it is a small block. The owner before me had it since the late 69's and traded the 396 for a 350 to some kids that offered to do all the work in the late 80's and said he diid'nt need all that power
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#18 | |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: big block vs tunnel hump...
Quote:
__________________
"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 ~ |
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#19 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: big block vs tunnel hump...
okadoke....sounds good to me....
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#20 | |
Registered User
Join Date: Sep 2010
Location: Los Angeles California
Posts: 352
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Re: big block vs tunnel hump...
Quote:
Which is not the case.. J.
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1972 Custom Deluxe Highlander C20 1971 Javelin SST New Project 1971 Demon 340 1969 SS El Camino 1968 SS RS 396 Camaro 1967 Barracuda Formula S 1965 140/4sp Corvair Monza Convertible Sorry, but I don't do Fords. |
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