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Old 01-02-2021, 07:43 PM   #1
superchevy
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'78 GMC SC 454/T400 long to short bed build

restoring a nice '78 GMC Sierra Classic...plans are tu cut it down to a short bed, new paint, refresh the interior, reseal the 454, add tbi and a 4L80e...maybe some other mods. Here's a pic of it as found in the backyard of the original owner in San Antonio about 3 years ago...and back at my place.
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-02-2021, 07:48 PM   #2
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

I traded the bed off it for a set of 67-68 buddy bucket seats.
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-02-2021, 07:53 PM   #3
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

about 6 months ago I took the 78 to buddy's chassis shop, where we cut it down to a short bed.
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-02-2021, 08:02 PM   #4
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Re: '78 GMC SC 454/T400 long to short bed build

now it's Jan 2021 and time to build it...rolled into the shop...working on the rear of the truck first...I still need to trim off 5" of the rear of the frame so the short bed will fit...i did get the rear crossmember relocated forward...here's a pic of the 1" lift shackle...that's right, I'm going up instead of lower on this one....now for a new diff cover, brake lines ordered, new rear brakes, some paint
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-03-2021, 07:47 PM   #5
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Re: '78 GMC SC 454/T400 long to short bed build

Got a little done today...cut 5.25" off the rear frame rails so the short bed will fit ....removed the diff brake lines...waiting on new ones from inline tube...removed the 2 piece driveshaft and carried bearing support...removed an exhaust hanger that's in the way of relocating the rear fuel tank...
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-03-2021, 09:01 PM   #6
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Re: '78 GMC SC 454/T400 long to short bed build

Looks cool. How much did you take out of the center of the frame? 14"? Do you have any pictures of the inside of the weld? I'm thinking of trying the same thing and wondering about options for reinforcing it.

Edit: What I mean is, do you have any pictures of the inside of the frame where it was welded? Any more of the measuring/cutting process would be great too.
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Old 01-03-2021, 11:53 PM   #7
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Re: '78 GMC SC 454/T400 long to short bed build

Interested in watching your progress.
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Old 01-08-2021, 11:53 AM   #8
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Re: '78 GMC SC 454/T400 long to short bed build

Quote:
Originally Posted by superchevy View Post
now it's Jan 2021 and time to build it...rolled into the shop...working on the rear of the truck first...I still need to trim off 5" of the rear of the frame so the short bed will fit...i did get the rear crossmember relocated forward...here's a pic of the 1" lift shackle...that's right, I'm going up instead of lower on this one....now for a new diff cover, brake lines ordered, new rear brakes, some paint
Curious about this.... What brand did you use? Did the shackle fit the leaf properly?
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Old 01-09-2021, 06:01 PM   #9
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Re: '78 GMC SC 454/T400 long to short bed build

Hey SCOTI, not sure yet as haven't installed it yet. I've got to rebuild the front suspension and install some new front springs with coil spring spacers...I need to see what the front end height is before I do the rear....limited options on the front for 2wd
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-10-2021, 01:42 PM   #10
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Re: '78 GMC SC 454/T400 long to short bed build

Quote:
Originally Posted by superchevy View Post
Hey SCOTI, not sure yet as haven't installed it yet. I've got to rebuild the front suspension and install some new front springs with coil spring spacers...I need to see what the front end height is before I do the rear....limited options on the front for 2wd
I bought/used some Western Chassis units that required 're-shaping' so they would work. Was curious if it was isolated or if it was more common.
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64SWB-Recycle
89CCDually-Driver/Tow Truck
99CCSWB Driver
All Fleetsides
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
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Old 01-17-2021, 09:07 PM   #11
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Re: '78 GMC SC 454/T400 long to short bed build

Got a little time to work on her today....what do you do when the shoes are up in the drums and the adjuster hole plugs are rusted in? You get the angle grinder out and some access to the shoes/springs/retainers....
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-17-2021, 09:10 PM   #12
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Re: '78 GMC SC 454/T400 long to short bed build

after getting the drums off, I could get the axles so I could replace the bearings and seals...simple right? mr. cross shaft pin said not so fast....ugh
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-17-2021, 09:13 PM   #13
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Re: '78 GMC SC 454/T400 long to short bed build

finally got the new bearings and seals installed....now to get some new brake hardware and finish the rear...
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__________________
'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 01-24-2021, 06:20 PM   #14
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Re: '78 GMC SC 454/T400 long to short bed build

with the new axle bearings and seals in, and a new diff lock bolt installed, I was able to get the new diff cover on and filled this weekend....also got the new shoes and brake hardware installed....getting closer
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 02-24-2021, 09:28 AM   #15
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Re: '78 GMC SC 454/T400 long to short bed build

Got the rear brake lines run, rear leaf springs and u bolts back together, new shocks and hardware
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 02-24-2021, 09:30 AM   #16
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Re: '78 GMC SC 454/T400 long to short bed build

the rear of the chassis is now complete and detailed...time to move to the front
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 02-24-2021, 09:32 AM   #17
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Re: '78 GMC SC 454/T400 long to short bed build

Finally got nearly all of the new suspension and steering parts in
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 02-24-2021, 09:34 AM   #18
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Re: '78 GMC SC 454/T400 long to short bed build

time to get the front clip disassembled...got a start on it last night
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 02-24-2021, 01:25 PM   #19
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Re: '78 GMC SC 454/T400 long to short bed build

Quote:
Originally Posted by superchevy View Post
after getting the drums off, I could get the axles so I could replace the bearings and seals...simple right? mr. cross shaft pin said not so fast....ugh
I think every open diff that I took apart that bolt was broke? The work on the back end looks great!
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Old 02-24-2021, 04:07 PM   #20
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Re: '78 GMC SC 454/T400 long to short bed build

Thanks! I got lucky on that bolt, lol. I was able to use a pick and rotate it out. Should've bought a lottery ticket that day!
__________________
'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 02-28-2021, 06:16 PM   #21
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Re: '78 GMC SC 454/T400 long to short bed build

got the front clip fully disassembled and the 454/T400 out to rebuild
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 02-28-2021, 06:20 PM   #22
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Re: '78 GMC SC 454/T400 long to short bed build

today started stripping the interior...
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 03-02-2021, 09:35 AM   #23
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Re: '78 GMC SC 454/T400 long to short bed build

I got the passenger door disassembled yesterday evening. I think I'm going to reuse the lower carpet/panel trims as both sides are near mint.
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 03-02-2021, 09:36 AM   #24
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

door panel carpet
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb

'72 Corvette convertible 454/4spd/ac, ps, pb

'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac

'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original

'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac

'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.

SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423

SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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Old 03-02-2021, 10:15 AM   #25
SCOTI
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Re: '78 GMC SC 454/T400 long to short bed build

This is coming completely apart
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
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