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

Mike Quillici · 10-23-2009, 12:51 AM

Hi All. . .I'm going to get a carpet kit for my truck, and I'm wondering how to tell which size "hump" covers the bell housing. I have a 350 turbo hydromatic.

I have no idea what these are. . .

**71blksuper4x4** · 10-23-2009, 01:35 AM

Mike, I am betting you have a low hump, as a high hump was on 4x4, manual trans, and turbo 400 only trucks. Here is a pic of my truck with a high hump: Trevor

Mike Quillici · 10-23-2009, 02:47 AM

Hey Trevor, Thanks a lot!

Longhorn Man · 10-23-2009, 06:03 AM

TH400 got a smnall hump.
Where does that come from? I hear a LOT of people say that.
4 speed, 4X4, and BIG BLOCK with AUTO.
If you got the TH400 with a small block or an inline... you got the low hump.
Plus, every once in a while one can't be explained. like my old GMC v-6 truck with a high hump.

**71blksuper4x4** · 10-23-2009, 11:18 AM

Andy, I think you hear it a lot because most of the time a turbo 400 came with big blocks. I never even knew someone could order the tranny without a big block. Trevor

69GMCLonghorn · 10-23-2009, 12:15 PM

Maybe that was for the rare optioned 250 I-6 with a TH400??? You'd need to put a blower on the 6 just to turn the gears in the dang thing! HAHA

sweet70beast · 10-23-2009, 02:31 PM

I had a 68 C-10 2wd with a 327/th400 and a high hump.

Longhorn Man · 10-23-2009, 05:30 PM

the TH350 was never installed in a pick up till 69, so ALL 3 speed auto trucks were TH400.

culp7 · 10-23-2009, 09:35 PM

low hump unless 4x4

Tx Firefighter · 10-23-2009, 09:58 PM

Quote:

Originally Posted by culp7

low hump unless 4x4

It's been well explained in the posts above. Plenty of 2 wheel drives had high humps.

68C15 · 10-23-2009, 09:47 PM

easy way to tell which you have is to look at it. if it bolts to the floor it is high. otherwise it's a low hump.
I prefer the high as it gives my foot a larger side rest

unclewatts · 10-24-2009, 03:59 AM

I think this has been gone over before. What everyone missed is that a 2WD SBC with manual floor shift has a high hump!

Tx Firefighter · 10-24-2009, 05:15 AM

Quote:

Originally Posted by unclewatts

I think this has been gone over before. What everyone missed is that a 2WD SBC with manual floor shift has a high hump!

Andy covered that in post number 4.

Longhorn Man · 10-24-2009, 10:21 AM

I am always amazed at how hard everyone makes this.

sweet70beast · 10-25-2009, 12:07 AM

Who's making it hard? If it bolts on it's a high hump if it doesn't bolt on and is not removable it's a low hump.

Two words that shouldn't be said when it comes to vehicles are ALWAYS and NEVER. Just when we think we know whats up something come along that shows us what we thot we knew was wrong. With the factory anything was possible odds are being a 72 with a th350 it's a low hump but for all we know some might have left with high humps because something on the assembly line could have been changed at the last minute.

I always thot th400s got a high hump because both trucks I've owned with th400s had high humps, one was a factory big block and the other was a factory small block.

swappy · 12-01-2010, 02:45 AM

So I could take a 4 speed cab and bolt a th400 hump in it, and have a cab that would be just like a factory th400 cab would have been?

*sharpie1972* · 12-01-2010, 10:43 AM

Quote:

Originally Posted by swappy

So I could take a 4 speed cab and bolt a th400 hump in it, and have a cab that would be just like a factory th400 cab would have been?

Yep! The trick is to find a high hump cover with no holes or repair the 4 speed cover that came with the cab. Sharpie

10-23-2009, 12:51 AM	#1
Mike Quillici Registered User Join Date: Oct 2009 Location: Sacramento, CA Posts: 161	Transmission Hump Hi All. . .I'm going to get a carpet kit for my truck, and I'm wondering how to tell which size "hump" covers the bell housing. I have a 350 turbo hydromatic. I have no idea what these are. . . __________________ 1972 Chevy C-10 ~ 188,000 miles give or take

10-23-2009, 01:35 AM	#2
71blksuper4x4 SWB 4x4 Collector Join Date: Jun 2001 Location: Osage City, KS Posts: 5,156	Re: Transmission Hump Mike, I am betting you have a low hump, as a high hump was on 4x4, manual trans, and turbo 400 only trucks. Here is a pic of my truck with a high hump: Trevor __________________ TREVOR 1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned) 1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank 1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT) http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205) 1970 Chevelle SS (LS5 454,th400,8track,buckets,tach) :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever

10-23-2009, 02:47 AM	#3
Mike Quillici Registered User Join Date: Oct 2009 Location: Sacramento, CA Posts: 161	Re: Transmission Hump Hey Trevor, Thanks a lot! __________________ 1972 Chevy C-10 ~ 188,000 miles give or take

10-23-2009, 06:03 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Transmission Hump TH400 got a smnall hump. Where does that come from? I hear a LOT of people say that. 4 speed, 4X4, and BIG BLOCK with AUTO. If you got the TH400 with a small block or an inline... you got the low hump. Plus, every once in a while one can't be explained. like my old GMC v-6 truck with a high hump.

10-23-2009, 11:18 AM	#5
71blksuper4x4 SWB 4x4 Collector Join Date: Jun 2001 Location: Osage City, KS Posts: 5,156	Re: Transmission Hump Andy, I think you hear it a lot because most of the time a turbo 400 came with big blocks. I never even knew someone could order the tranny without a big block. Trevor __________________ TREVOR 1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned) 1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank 1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT) http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205) 1970 Chevelle SS (LS5 454,th400,8track,buckets,tach) :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever

10-23-2009, 12:15 PM	#6
69GMCLonghorn Registered User Join Date: Dec 2006 Location: Porter Ranch, CA Posts: 978	Re: Transmission Hump Maybe that was for the rare optioned 250 I-6 with a TH400??? You'd need to put a blower on the 6 just to turn the gears in the dang thing! HAHA

10-23-2009, 02:31 PM	#7
sweet70beast Registered User Join Date: Sep 2006 Location: Shelley Idaho Posts: 876	Re: Transmission Hump I had a 68 C-10 2wd with a 327/th400 and a high hump. __________________ 1970 Nova 327/T5 (my 1st car) 1971 K-20 350/350/205 (winter DD) 1953 GMC Suburban 1968 Chevy Bel Air 1976 Chev C-10 1972 Skylark (suncoupe) 1 of 3943 made

10-23-2009, 05:30 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Transmission Hump the TH350 was never installed in a pick up till 69, so ALL 3 speed auto trucks were TH400.

10-23-2009, 09:35 PM	#9
culp7 HickTown Join Date: Apr 2009 Location: ANDOVER, Kansas Posts: 355	Re: Transmission Hump low hump unless 4x4 __________________ 1993 Ford Mustang Vert w/ 2.3 1969 Chevy C/10 w/350 1968 Chevy C-20 w/250 1976 Dodge Aspen W/ 225 2000 Toyota Tundra w/4.7 1987 Dodge Ram D-100 w/360 255/70-15 ___________ (oo)══╬══(oo) ‾‾‾‾‾‾‾‾‾‾‾

10-23-2009, 09:47 PM	#11
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: Transmission Hump easy way to tell which you have is to look at it. if it bolts to the floor it is high. otherwise it's a low hump. I prefer the high as it gives my foot a larger side rest

10-24-2009, 03:59 AM	#12
unclewatts 70 Chevrolet=Obsession Join Date: Jun 2009 Location: nice ca Posts: 1,067	Re: Transmission Hump I think this has been gone over before. What everyone missed is that a 2WD SBC with manual floor shift has a high hump! __________________ I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner)

10-24-2009, 10:21 AM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Transmission Hump I am always amazed at how hard everyone makes this.

10-25-2009, 12:07 AM	#15
sweet70beast Registered User Join Date: Sep 2006 Location: Shelley Idaho Posts: 876	Re: Transmission Hump Who's making it hard? If it bolts on it's a high hump if it doesn't bolt on and is not removable it's a low hump. Two words that shouldn't be said when it comes to vehicles are ALWAYS and NEVER. Just when we think we know whats up something come along that shows us what we thot we knew was wrong. With the factory anything was possible odds are being a 72 with a th350 it's a low hump but for all we know some might have left with high humps because something on the assembly line could have been changed at the last minute. I always thot th400s got a high hump because both trucks I've owned with th400s had high humps, one was a factory big block and the other was a factory small block. __________________ 1970 Nova 327/T5 (my 1st car) 1971 K-20 350/350/205 (winter DD) 1953 GMC Suburban 1968 Chevy Bel Air 1976 Chev C-10 1972 Skylark (suncoupe) 1 of 3943 made Last edited by sweet70beast; 10-25-2009 at 12:08 AM.

12-01-2010, 02:45 AM	#16
swappy Registered User Join Date: Nov 2008 Location: Rapid City SD Posts: 36	Re: Transmission Hump So I could take a 4 speed cab and bolt a th400 hump in it, and have a cab that would be just like a factory th400 cab would have been? __________________ Rick 71 C10 long fleet sold 72 C10 short fleet 72 Olds cutlass 85 442 87 442



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