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01-25-2008, 10:12 AM
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#1 |
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Senior Member
 
Join Date: Nov 2001
Location: Rapid City, SD
Posts: 2,281
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Big Block, TH400, CAB...... Question?
I have a friend putting a Big Block with a TH400 into a '68 Shortbox (longbox frame cut to Shortbox) The truck was originally a V-8/SM465 truck (2wd)...
He noticed in a carpet ad for our trucks that a BB with TH400 takes different carpet... Questions.... Is the cab different, and how...? Will a BB with TH400 fit without modifications (other than crossmember & motor mount towers)... I believe his cab is a high hump 2wd (I could be wrong, might be a low hump 2wd, but its NOT an original BB/TH400 cab)
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My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White |
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01-25-2008, 10:15 AM
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#2 |
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Registered User
Join Date: Mar 2004
Location: CA
Posts: 2,057
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Re: Big Block, TH400, CAB...... Question?
the floor is actually raise up around the transmission tunnel on the big block trucks, and on 4x4's for that matter.
there called high hump, and low hump. you'll need to cut out the floor, and find a high hump to put in there. |
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01-25-2008, 10:22 AM
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#3 |
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Real Projects never die
Join Date: Jan 2007
Location: Lawrence, kansas
Posts: 1,508
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Re: Big Block, TH400, CAB...... Question?
didnt the sm465 have a big hump too?
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Ill put it this way, ive got a few lawn ornaments   My name tag says Ryan KansasTwister On other forums
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01-25-2008, 10:22 AM
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#4 |
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Senior Member
Join Date: Nov 2001
Location: Rapid City, SD
Posts: 2,281
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Re: Big Block, TH400, CAB...... Question?
oh, is it different than an original SM465 high hump.... I'm familiar with the low hump / high hump cabs.... but is an original BB/TH400 cab a THIRD type hump....
What makes a BB/TH400 carpet different than a anything else high hump cab? My '67 CST factory 283/SM465 has a high hump cab (floor) in it.... furthermore... Will he need to modify the cab/floor to install a BB/TH400 into a non factory BB/TH400 truck.... Say he has a high hump small block 4 speed cab... will he need to changeanything besides motor mount towers annd trans crossmember....?
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My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White Last edited by 67 cst swb; 01-25-2008 at 10:28 AM. |
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01-25-2008, 10:37 AM
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#5 |
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Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,080
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Re: Big Block, TH400, CAB...... Question?
The truck if equiped with 465 has the SAME hump as the Big block just buy high hump carpet and you will be good to go. As long as your friend has the correct mounts and cross member, he just needs to remove the four speed c member bolt in the auto member and get the correct drive shaft. The intermediate cable for the emergncy brake may not work with new set up- big block use different cable, new fan shroud and 400 auto linkage- th350 will work but new holes will have to be drilled.
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01-25-2008, 11:14 AM
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#6 |
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Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Big Block, TH400, CAB...... Question?
You can put the 400 in a low hump truck but may have to get a different trans mount and lower the cross member. I put the turbo 400 and a 208 transfer case in my 69 4x4 with a CST two wheel drive cab low hump.
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69 Chevy 4x4 383 Power 
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01-25-2008, 03:32 PM
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#7 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: Big Block, TH400, CAB...... Question?
4 speed trucks have the same high hump as big block trucks, only, there's a hole in the top.
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01-25-2008, 04:34 PM
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#8 |
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Senior Member
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: Big Block, TH400, CAB...... Question?
just to note, I put a 402/th400 in a 72 350 auto truck(low hump) and it fits with no modifications needed other than the big block stuff. If anyone is doing this, they might try to put new bushing under the cab which will probably raise it up enough to clear a th400. however, since his is a 4 speed truck, all he needs to do is buy a big block transmission hump and the correct big block/th400 pieces and he's good to go with no problems. hope this helps.
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68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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01-27-2008, 12:35 PM
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#9 | ||
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Senior Member
Join Date: Nov 2001
Location: Rapid City, SD
Posts: 2,281
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Re: Big Block, TH400, CAB...... Question?
Quote:
Quote:
I'm thinking we'll just weld up his old 4 speed hump....
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My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White Last edited by 67 cst swb; 01-27-2008 at 12:37 PM. |
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01-27-2008, 09:19 PM
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#10 |
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Senior Member
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: Big Block, TH400, CAB...... Question?
if you put carper in it, know one will ever be able to tell by looking. it's not a bad idea to buy the big block motor mounts, etc though as it will make the engine sit in the factory bb location. i'm not sure if the transmission crossmember is different or not, but you prolly want to check into that also. good luck with the swap and have fun with the rat motor!
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68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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