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

**425HP409** · 05-08-2012, 02:27 PM

I would like to know why there seems to be a great interest in the High Hump floor pans. I know that a floor shift Granny 4 speed truck had to have them. I have a 68 C10 that was originally a small block with a Powerglide transmission and it came with a low hump. I have installed a TH700R4 in it under the low hump with no problems. I am planning on installing a Big Block in the near future and will be using the 67-71 frame mounts for it. Will I have any problems doing this and keeping my Low Hump? Did all Big Block trucks originally come with a High Hump?
Thanks,
Charles

midniteblues · 05-08-2012, 02:32 PM

I put one in just too lift the shifter a lil'

**425HP409** · 05-14-2012, 11:11 PM

ttt

Willys47 · 05-15-2012, 12:03 AM

big blocks with a t 400 will fit under a low hump floor

hugger6933 · 05-15-2012, 07:18 AM

I don't know this to be fact but I think some of the guys that lower their trucks[a lot] use them as well. Big blocks did and 4x4's did as well. I have one big block truck that has one and I am putting one in my two 70's that I am building one for a big block and the other for a t-5 ,Neither of witch has to have the high humps for me it is more of a wnat thing I guess. I also plan to put one in my C-60 project and I know for sure that it won't need one but if I put in a floor hump in that big truck I can then order a regular truck carpet for it[I think]

**425HP409** · 05-15-2012, 11:46 AM

Quote:

Originally Posted by hugger6933

I don't know this to be fact but I think some of the guys that lower their trucks[a lot] use them as well. Big blocks did and 4x4's did as well. I have one big block truck that has one and I am putting one in my two 70's that I am building one for a big block and the other for a t-5 ,Neither of witch has to have the high humps for me it is more of a wnat thing I guess. I also plan to put one in my C-60 project and I know for sure that it won't need one but if I put in a floor hump in that big truck I can then order a regular truck carpet for it[I think]

The C-10 thru C-60 trucks used the same floor pan so you can order carpet for a pickup to fit the C-60. You just have to make sure to order for a low or high hump, depending what you have in the truck.

67c10rustbuket · 05-15-2012, 05:44 PM

With worn out cab mounts my 4L60E is resting against the floor, a little close for comfort even with new cab mounts. Thats why I got a high hump.

If you run a Porterbuilt "front dropmember" it is required because the dropmember raises the engine/trans 1.5". No I don't have one yet but I hope someday I will have...

Z-ing the frame or other sectioning of the frame/suspension to get your frame to lay flat may also raise the drivetrain and cause floor interference.

I think T-56 swaps (late model 6 speed) are taller than an old school tranny and hits the floor from what I have seen in other builds on here.

High humps are cooler than low humps

Thats my 2 cents, and carpet is specific to high hump or not.

Beat68CST · 05-15-2012, 06:29 PM

Low humps are wayyyy cooler!

I made my Cummins and 47RH fit under a low hump, I cut the crossmember up instead of changing humps and messing with my trans crossmember.

hugger6933 · 05-15-2012, 10:01 PM

Are'nt the floors in the med duty like C40-50 -60 flat in the floor or a low hump. I was thinking they had a flat floor panel where the hump should be. I looked at on today[C50] but didn't notice the hump I was too busy looking at the original paint 24,344 mile truck and the orginal no rip seat.

05-08-2012, 02:27 PM	#1
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	High Hump I would like to know why there seems to be a great interest in the High Hump floor pans. I know that a floor shift Granny 4 speed truck had to have them. I have a 68 C10 that was originally a small block with a Powerglide transmission and it came with a low hump. I have installed a TH700R4 in it under the low hump with no problems. I am planning on installing a Big Block in the near future and will be using the 67-71 frame mounts for it. Will I have any problems doing this and keeping my Low Hump? Did all Big Block trucks originally come with a High Hump? Thanks, Charles __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette

05-08-2012, 02:32 PM	#2
midniteblues Registered User Join Date: Jul 2011 Location: strausstown pa Posts: 3,394	Re: High Hump I put one in just too lift the shifter a lil' Attached Images __________________ 81 camaro 355 4/spd 342 posi my first love. 67 swb step 454/4spd ott 373 posi 4/7 drop. 2000 s10 zr2 little blue truck that never gets stuck. '74 heald super bronc vt8. tecumseh powered moon rover.

05-14-2012, 11:11 PM	#3
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Re: High Hump ttt __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette

05-15-2012, 12:03 AM	#4
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: High Hump big blocks with a t 400 will fit under a low hump floor __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!!

05-15-2012, 07:18 AM	#5
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,280	Re: High Hump I don't know this to be fact but I think some of the guys that lower their trucks[a lot] use them as well. Big blocks did and 4x4's did as well. I have one big block truck that has one and I am putting one in my two 70's that I am building one for a big block and the other for a t-5 ,Neither of witch has to have the high humps for me it is more of a wnat thing I guess. I also plan to put one in my C-60 project and I know for sure that it won't need one but if I put in a floor hump in that big truck I can then order a regular truck carpet for it[I think]

05-15-2012, 05:44 PM	#7
67c10rustbuket Registered User Join Date: Apr 2011 Location: Mustang, Oklahoma Posts: 2,806	Re: High Hump With worn out cab mounts my 4L60E is resting against the floor, a little close for comfort even with new cab mounts. Thats why I got a high hump. If you run a Porterbuilt "front dropmember" it is required because the dropmember raises the engine/trans 1.5". No I don't have one yet but I hope someday I will have... Z-ing the frame or other sectioning of the frame/suspension to get your frame to lay flat may also raise the drivetrain and cause floor interference. I think T-56 swaps (late model 6 speed) are taller than an old school tranny and hits the floor from what I have seen in other builds on here. High humps are cooler than low humps Thats my 2 cents, and carpet is specific to high hump or not. __________________ Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car

05-15-2012, 06:29 PM	#8
Beat68CST Registered User Join Date: Oct 2010 Location: Buckeye Arizona Posts: 470	Re: High Hump Low humps are wayyyy cooler! I made my Cummins and 47RH fit under a low hump, I cut the crossmember up instead of changing humps and messing with my trans crossmember.

05-15-2012, 10:01 PM	#9
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,280	Re: High Hump Are'nt the floors in the med duty like C40-50 -60 flat in the floor or a low hump. I was thinking they had a flat floor panel where the hump should be. I looked at on today[C50] but didn't notice the hump I was too busy looking at the original paint 24,344 mile truck and the orginal no rip seat.



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