Low or High Hump with stock350/TH400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

syncrov69 · 08-06-2008, 10:02 AM

Hi, I have a stock 350/TH400 combo (from a 1971 c/30 donor truck) to put in my 1971 C/10. My cab have presently a low hump. Is it necessary to change for a High hump to fit the engine/tranny? Thank's

paintpyro · 08-06-2008, 10:27 AM

Currently have the same set up with a low hump cab.

chevy_mike · 08-06-2008, 12:34 PM

My '68 is the same combo and it a low hump. From what I recall, auto's were low hump, manual's were high hump, at least from the factory. Who knows what's been swapped over the years.

Longhorn Man · 08-06-2008, 04:00 PM

4x4 trucks, 4 speeds, and big bloxks with automatic... those were the only stock trucks supposed to have a high hump.
So yes, your small block/auto will be fine.
Sometimes an odd ball rolled off the assembly line for unknown reasons. i had a 69 GMC, was a V6/TH400... had the high hump.

Luvlegs · 08-07-2008, 11:25 AM

hmmm got me thinking now... Any idea if a 454/400 will need the high hump? I'm using the 72 only mounts and the truck currently has the I6 w/3OTT....

Longhorn Man · 08-07-2008, 12:26 PM

if you have good cab mounts, it'll probably work, many have done it.
However, i have found excessive heat radiates through the floor when it is that close. My caddy engine places the TH350 about 1/4 inch from the pinchweld on my floor. It is not uncommon for my floor boards to be 125 degrees in the summer.

Luvlegs · 08-07-2008, 12:29 PM

ewwwwww I'll already have a hot foot when I fire it up - don't really need the extra heat! I'll be wrapping my headers to help a bit with the underhood heat - I wonder if there'll be enough room to perhaps put an aluminum heat sheild over the tranny, standing off from the floor.... we'll see.

08-06-2008, 10:02 AM	#1
syncrov69 Registered User Join Date: Aug 2007 Location: Laval, Québec, Canada Posts: 175	Low or High Hump with stock350/TH400 Hi, I have a stock 350/TH400 combo (from a 1971 c/30 donor truck) to put in my 1971 C/10. My cab have presently a low hump. Is it necessary to change for a High hump to fit the engine/tranny? Thank's __________________ '71 Custom/10 Deluxe LWB '71 Custom/30 Deluxe Dually Last edited by syncrov69; 08-06-2008 at 10:03 AM.

08-06-2008, 10:27 AM	#2
paintpyro Registered User Join Date: Aug 2001 Location: Santa Fe Springs, CA,USA Posts: 1,579	Re: Low or High Hump with stock350/TH400 Currently have the same set up with a low hump cab. __________________ 70 shortbed stepside "Schleprock" 350 w/TH400 rallys and BFGs -We can rebuild it, we have the technology-lower,shinier,faster

08-06-2008, 12:34 PM	#3
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: Low or High Hump with stock350/TH400 My '68 is the same combo and it a low hump. From what I recall, auto's were low hump, manual's were high hump, at least from the factory. Who knows what's been swapped over the years. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

08-06-2008, 04:00 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Low or High Hump with stock350/TH400 4x4 trucks, 4 speeds, and big bloxks with automatic... those were the only stock trucks supposed to have a high hump. So yes, your small block/auto will be fine. Sometimes an odd ball rolled off the assembly line for unknown reasons. i had a 69 GMC, was a V6/TH400... had the high hump.

08-07-2008, 11:25 AM	#5
Luvlegs Registered User Join Date: Sep 2005 Location: Smith Mountain Lake Virginia Posts: 1,537	Re: Low or High Hump with stock350/TH400 hmmm got me thinking now... Any idea if a 454/400 will need the high hump? I'm using the 72 only mounts and the truck currently has the I6 w/3OTT.... __________________ "A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! Last edited by Luvlegs; 08-07-2008 at 11:26 AM.

08-07-2008, 12:26 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Low or High Hump with stock350/TH400 if you have good cab mounts, it'll probably work, many have done it. However, i have found excessive heat radiates through the floor when it is that close. My caddy engine places the TH350 about 1/4 inch from the pinchweld on my floor. It is not uncommon for my floor boards to be 125 degrees in the summer.

08-07-2008, 12:29 PM	#7
Luvlegs Registered User Join Date: Sep 2005 Location: Smith Mountain Lake Virginia Posts: 1,537	Re: Low or High Hump with stock350/TH400 ewwwwww I'll already have a hot foot when I fire it up - don't really need the extra heat! I'll be wrapping my headers to help a bit with the underhood heat - I wonder if there'll be enough room to perhaps put an aluminum heat sheild over the tranny, standing off from the floor.... we'll see. __________________ "A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew!



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