Cab mods requires to use a BBC/TH400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C10_ustacould · 02-10-2011, 02:58 PM

I have seen a lot of talk about "high humps" and I know few guys sell them over in the parts area. I am new to these trucks so I need to know, is necessary to have a high hump if I am putting a big block and T400 in my truck?

*454stepside* · 02-10-2011, 03:02 PM

1 have a 67 chevy pickup with a 454 and th400 and did not need to put a high hump in mine to fit the motor and trans in it

**Classic Bowties** · 02-10-2011, 03:33 PM

Depends on the BBC/TH400 install position in the frame and also the condition of the cab mounts, GM used the bolt in tall tunnel cover on these applications for a reason. Mel

kelsfine69 · 02-10-2011, 05:08 PM

My truck originaly came with a th400 and a small block 350. I put the 454 in with the big block towers and it fit fine

**LockDoc** · 02-10-2011, 05:29 PM

-
I've got a 454/TH400 in the White '67 with a low hump. No problem...

LockDoc

alsriv2 · 02-11-2011, 10:28 AM

Can anyone submit a couple of pictures showing the side profile of the high and low humps? (maybe installed in trucks) I have wondered the same thing would like to see the difference.

I have one truck (GMC) that has a 350 SBC/TH400 and another that has a
396BBC/TH400. Both transmission humps appear to be the same in these two trucks. If I have tall humps and a short will work, I will probably change. If I have two shorts, then I am good to go!

Thank you!

Al
'69 GMC 2500 Custom Camper
'69 Chevy C10 396

*454stepside* · 02-11-2011, 01:22 PM

high humps are bolted in and low humps are parts of the floor and not removable unless you cut it out

**LockDoc** · 02-11-2011, 01:32 PM

-
Lots of pics of high humps in parts for sale forum.

LockDoc

BossHogg69 · 02-11-2011, 01:46 PM

My '69 was originally a 307/Powerglide truck - low hump. My grandfather (was his truck originally) put in a 454/TH400 with '72 motor mounts and it fit under the low hump no problem.

C10_ustacould · 02-11-2011, 04:54 PM

Sounds like it is no problem to use a BBC/TH400 with the low hump, but the access provided by the removable high hump is nice to have. I am going to give it a go with the stock floor.

02-10-2011, 02:58 PM	#1
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,870	Cab mods requires to use a BBC/TH400 I have seen a lot of talk about "high humps" and I know few guys sell them over in the parts area. I am new to these trucks so I need to know, is necessary to have a high hump if I am putting a big block and T400 in my truck?

02-10-2011, 03:02 PM	#2
454stepside Account Suspended Join Date: Dec 2010 Location: Falcon Colorado Posts: 1,029	Re: Cab mods requires to use a BBC/TH400 1 have a 67 chevy pickup with a 454 and th400 and did not need to put a high hump in mine to fit the motor and trans in it

02-10-2011, 03:33 PM	#3
Classic Bowties Always on the hunt... Join Date: Sep 2006 Location: Portland, OR. Posts: 5,577	Re: Cab mods requires to use a BBC/TH400 Depends on the BBC/TH400 install position in the frame and also the condition of the cab mounts, GM used the bolt in tall tunnel cover on these applications for a reason. Mel

02-10-2011, 05:08 PM	#4
kelsfine69 18 Till I Die Join Date: Mar 2005 Location: Alberta, Canada Posts: 1,522	Re: Cab mods requires to use a BBC/TH400 My truck originaly came with a th400 and a small block 350. I put the 454 in with the big block towers and it fit fine __________________ 2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home...

02-10-2011, 05:29 PM	#5
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,402	Re: Cab mods requires to use a BBC/TH400 - I've got a 454/TH400 in the White '67 with a low hump. No problem... LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

02-11-2011, 10:28 AM	#6
alsriv2 Registered User Join Date: Sep 2010 Location: Formerly MD and San Diego, now loving life in Arizona Posts: 1,636	Re: Cab mods requires to use a BBC/TH400 Can anyone submit a couple of pictures showing the side profile of the high and low humps? (maybe installed in trucks) I have wondered the same thing would like to see the difference. I have one truck (GMC) that has a 350 SBC/TH400 and another that has a 396BBC/TH400. Both transmission humps appear to be the same in these two trucks. If I have tall humps and a short will work, I will probably change. If I have two shorts, then I am good to go! Thank you! Al '69 GMC 2500 Custom Camper '69 Chevy C10 396

02-11-2011, 01:22 PM	#7
454stepside Account Suspended Join Date: Dec 2010 Location: Falcon Colorado Posts: 1,029	Re: Cab mods requires to use a BBC/TH400 high humps are bolted in and low humps are parts of the floor and not removable unless you cut it out

02-11-2011, 01:32 PM	#8
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,402	Re: Cab mods requires to use a BBC/TH400 - Lots of pics of high humps in parts for sale forum. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

02-11-2011, 01:46 PM	#9
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: Cab mods requires to use a BBC/TH400 My '69 was originally a 307/Powerglide truck - low hump. My grandfather (was his truck originally) put in a 454/TH400 with '72 motor mounts and it fit under the low hump no problem. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

02-11-2011, 04:54 PM	#10
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,870	Re: Cab mods requires to use a BBC/TH400 Sounds like it is no problem to use a BBC/TH400 with the low hump, but the access provided by the removable high hump is nice to have. I am going to give it a go with the stock floor.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.