![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
|
Low Hump to High Hump conversion
Can anyone give me a step by step procedure for replacing the low hump with a high hump in my 68?
__________________
1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles ![]() 18.5" x 31" Hoosier Pro Street Radials ![]() ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree ![]() |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: May 2010
Location: ambler, pa
Posts: 325
|
Re: Low Hump to High Hump conversion
Bump I need it too
__________________
Just would like the snow to stop so I can actually work on my truck!!!!!!!!!!! |
![]() |
![]() |
![]() |
#3 |
Registered User
![]() Join Date: Jan 2009
Location: marion nc
Posts: 588
|
Re: Low Hump to High Hump conversion
me three... is the high hump a must have if you put in a big block? or is it the trans you use?
__________________
69 short fleet 350/350 "under construction" 70 short step 307/3 speed |
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
|
Re: Low Hump to High Hump conversion
Been awhile (15 yrs) since I done mine but sure someone will add to it. Remove the seat, carpet/ or mat and any thing on the floor for access. Carefully mark the floor with chalk for cutout. Remove anything under the floor ie D/S and tranny. Cut out the area with a torch / plasma cutter staying within the area you marked. Install the high hump and put your new mat or carpet in and seat. If your putting a tranny shift thru the floor you can install the high hump cover after the tranny.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629" |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: May 2010
Location: ambler, pa
Posts: 325
|
Re: Low Hump to High Hump conversion
From what I have heard on here you need the high hump for the big block
__________________
Just would like the snow to stop so I can actually work on my truck!!!!!!!!!!! |
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
|
Re: Low Hump to High Hump conversion
To hold the hump down since my cab was still installed I used some 1/2" or 7/16" diameter self tapping bolts, w/ washer and a small bit to pre-drill my location.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629" |
![]() |
![]() |
![]() |
#7 | |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
|
Re: Low Hump to High Hump conversion
Quote:
Most likely it is really only needed with a 4x4 to clear the transfer case.
__________________
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
|
![]() |
![]() |
![]() |
#8 |
yes, i do
Join Date: Jun 2007
Location: Spokane, wa
Posts: 2,734
|
Re: Low Hump to High Hump conversion
pretty much the only reason to go high hump is if you are switching from a th350(2wd) or the 3 on the tree(2wd). i don't remember if the 4wd versions needed the high hump or not. but the size of the popular saginaw and muncie 4 speeds as well as the th400 required the extra clearance. that's why when i swap cabs on my 72 i'm gonna look for a 4-5 speed that doesn't require the high hump and will allow me to use the stock 2 piece shaft
__________________
ERROR 404....... SNAPPY COMEBACK NOT FOUND ![]() _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900 |
![]() |
![]() |
![]() |
#9 |
Registered User
![]() Join Date: Jan 2009
Location: marion nc
Posts: 588
|
Re: Low Hump to High Hump conversion
good info on the trans part guys. if that the case i just keep my low hump and run a th350. thanks
__________________
69 short fleet 350/350 "under construction" 70 short step 307/3 speed |
![]() |
![]() |
![]() |
#10 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
|
Re: Low Hump to High Hump conversion
I have seen trucks with a BBC/TH400 with a low hump cab.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
![]() |
![]() |
![]() |
#11 |
What?
Join Date: Jun 2007
Location: Southern California
Posts: 7,617
|
Re: Low Hump to High Hump conversion
I know that on my burb with its high hump, while running an sm465 trans I could not run a low hump if I wanted to.
The t-case is behind the hump, but the shifter bracket pokes through the high hump. I knew a guy that had a 69 GMC PU that he converted to 4x4. It was an automatic, and he still ran the low hump.
__________________
Chris 1968 K20 Suburban 1972 K10 LWB PU |
![]() |
![]() |
![]() |
#12 |
Registered User
![]() Join Date: Apr 2000
Location: Bradenton, FL
Posts: 1,036
|
Re: Low Hump to High Hump conversion
Im running a 402 with a 700R4 in a low hump.
__________________
1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters |
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
|
Re: Low Hump to High Hump conversion
It all depends on how you want to set your motor. I have a 383, T400,208 transfer case, and a Gear Vendors OD all in a low hump C10 converted to a 3/4 ton 4x4.
__________________
69 Chevy 4x4 383 Power ![]() |
![]() |
![]() |
![]() |
#14 |
Active Member
![]() Join Date: Jun 2002
Location: L.A. Lower Alabama
Posts: 453
|
Re: Low Hump to High Hump conversion
Someone correct me if I am wrong but they way I see it with the standard 4sp they put the high hump in there so you could get to the top cap just in case you needed to inspect the gears or change shifter balls so you wouldn't have to drop the tranny. If I remember those things weigh a ton. As far as other trucks with different engine transmission combos it was probably a money thing, its cheaper to make a cover than a different floor, if a truck was going down the line and a change was made or they didn't have low hump floor it got a high hump. Thats why you see trucks with the same engine/trans combo some with low and some with high humps.
Just my thinking, might be wrong though.
__________________
1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin |
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: Nov 2009
Location: Roanoke, LA
Posts: 101
|
Re: Low Hump to High Hump conversion
i've already cut out part of my floor for my tranny and i can't seem to find a 4x4 high hump anywhere. more like i'm looking in the wrong spot. i was told that it is a bolt in replacement.
__________________
Bird |
![]() |
![]() |
![]() |
#16 |
Registered User
Join Date: Nov 2009
Location: Roanoke, LA
Posts: 101
|
Re: Low Hump to High Hump conversion
anyone know where to find the high hump or 4x4 transmission tunnel for a replacement?
thnx, bird
__________________
Bird |
![]() |
![]() |
![]() |
#17 | |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
|
Re: Low Hump to High Hump conversion
Quote:
__________________
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
|
![]() |
![]() |
![]() |
#18 |
Active Member
![]() Join Date: Jun 2002
Location: L.A. Lower Alabama
Posts: 453
|
Re: Low Hump to High Hump conversion
If you can't find one locally or from another board member try ECE. They show one in their used parts. Probally worth calling to see if they have one for a manual trans.
http://www.earlyclassic.com/tech.asp...y=Used%20Parts
__________________
1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin |
![]() |
![]() |
![]() |
#19 |
Registered User
Join Date: Feb 2009
Location: Kershaw, South Carolina
Posts: 113
|
Re: Low Hump to High Hump conversion
I found two at pull-a-part a couple of weeks ago.
|
![]() |
![]() |
![]() |
Bookmarks |
|
|