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#1 |
Registered User
Join Date: Dec 2004
Location: Stephenville, Texas
Posts: 420
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Changing from low hump to high hump?
I have a 3/4 ton 70 GMC 4x4 4 speed that I will be using the frame and running gear from. I will be putting my 72 1/2 ton automatic cab on it. What do I do to make it fit?
Thanks in advance.
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72 Super Cheyenne lwb 4X4 Ocra / White ![]() 88 Chevy 1 ton Dumptruck ![]() 88 Chevy 1ton Flat bed 4X4 white ![]() |
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#2 |
Registered User
Join Date: Jan 2007
Location: Sonoma, CA
Posts: 521
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Re: Changing from low hump to high hump?
If you still have the 70 cab, just the sheet metal that you need out of it..
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Oscar '72 Shortbed Fleetside '95 Jimmy 4X4 '69 GMC Custom Camper |
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#3 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Changing from low hump to high hump?
yep, the high hump bolts in/out of the old cab.
Toss it in onto the floor of the new cab, trace it, cut a hole one inche smaller than the traced shape, drill holes, bolt it in place with some seam sealer or good silicone (the right stuff by permitex) and call it a day. |
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#4 |
Registered User
Join Date: Mar 2008
Location: Forman, ND
Posts: 365
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Re: Changing from low hump to high hump?
I need to do the exact opposite! I dont have an automatic cab layin around to cut the floor out of tho...
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#5 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: Changing from low hump to high hump?
Can anyone tell me if the 2wd 4 speed humps are the same heighth as the 4x4 4 speed humps? Thanks Ryan.
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#6 | |
Registered User
Join Date: Aug 2008
Location: DFW, Texas
Posts: 389
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Re: Changing from low hump to high hump?
Quote:
I have an automatic cab...just trying to see how I can cut mine out and still bolt in the high hump. Is the high hump wider? Last edited by Longhorn Man; 11-11-2008 at 11:35 PM. Reason: WTS post |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Changing from low hump to high hump?
All high humps are the same size. So if you locate a big block autmomatic hump with no holes, then it'll be the same height as any other high hump with hols in it for shifters.
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#8 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: Changing from low hump to high hump?
Just a note - the high humps with shifter holes have 3 different locations for the holes. Don't ask me how I know.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD ![]() Click here to support the board Philippians 4: 6-7 |
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#9 |
Registered User
Join Date: Aug 2008
Location: DFW, Texas
Posts: 389
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Re: Changing from low hump to high hump?
interesting... The truck I bought is a bigblock auto and I believe it is a small hump. It does not bolt in, it is a solid floor piece.
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#10 |
Registered User
Join Date: Mar 2008
Location: Forman, ND
Posts: 365
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Re: Changing from low hump to high hump?
I have also heard that 2wd big block/auto trucks had high hump trans covers.
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1971 Cheyenne Short Fleet - 468BB/TH400, Tilt, Tach, PS, PB 1967 Custom Short Fleet - 327/4spd |
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#11 |
Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Re: Changing from low hump to high hump?
Here is what I did on my truck Killer
![]() ![]() ![]() ![]() ![]() Last edited by Spray-Bomb; 11-12-2008 at 12:24 PM. |
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#12 |
Registered User
Join Date: Mar 2008
Location: Forman, ND
Posts: 365
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Re: Changing from low hump to high hump?
That looks like a very clean install. Nice work!
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1971 Cheyenne Short Fleet - 468BB/TH400, Tilt, Tach, PS, PB 1967 Custom Short Fleet - 327/4spd |
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#13 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: Changing from low hump to high hump?
Very nice! My Longhorn was a BBC truck with a 4 speed and it has a high hump.
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#14 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Changing from low hump to high hump?
There's been a handfull of trucks that have popped up here and there that were factory big block/autos with a low hump... but they were supposed to get high hump. The only big block that was supposed to get the low hump is a big block with a 3 sppedmanual... not a common combination.
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#15 |
Registered User
Join Date: Dec 2004
Location: Stephenville, Texas
Posts: 420
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Re: Changing from low hump to high hump?
Thanks for the info. I am sure I will have more questions as this is my first body swap.
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72 Super Cheyenne lwb 4X4 Ocra / White ![]() 88 Chevy 1 ton Dumptruck ![]() 88 Chevy 1ton Flat bed 4X4 white ![]() |
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#16 |
Still livin the "dream" in '54
Join Date: Nov 2006
Location: Tucson, AZ
Posts: 2,656
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Re: Changing from low hump to high hump?
I just plaz'ed my low hump out and welded in the new one where it bolts up and seam sealed it really good.
I had custom carpet put in so I didn't have to worry about my old stuff fitting. Don
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Current build. 1954 Chevrolet 3800 "Ella" SOLD! My '67 stepper "Tangerine Dream" "Anything worth doing is worth doing right" James Dean “When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.” Sherlock Holmes "There is no spoon." Neo |
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#17 |
upgrading to an older model
Join Date: Aug 2007
Location: Sacramento, KY
Posts: 346
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Re: Changing from low hump to high hump?
I switched from a I6 - 3 OTT combo to 307 - 700R4 combo. For some reason the tranny hit the low hump and wouldn't fit (wrong mounts, moved mounts, too tall tranny...whatever) so a sawzall and a $18.00 Highhump off ebay and problem solved. its not "bolted" in yet but it fits great...My (and probably one you will have if your going from low to high) question is how to attach and what kind of sealer if any. I'm thinking about using a bead of silicone and short self-tapping screws since there are no previous holes in the cab floor. Any suggestions?
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68 stepside, short-box, multi-colored (for now) ![]() ![]() ![]() |
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