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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 01-08-2021, 11:53 AM   #6
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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   #7
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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 01-03-2021, 09:01 PM   #8
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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   #9
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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 03-09-2021, 05:58 AM   #10
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Re: '78 GMC SC 454/T400 long to short bed build

Might be messy, but it looks like you're winning.
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Old 03-09-2021, 09:37 PM   #11
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

Decided to remove the lower control arm bushings this evening...the drill method is the easiest I've found...going to use Prothane bushings/sleeves, so keeping the existing shells in place...also sprayed down the spindles with oven cleaner to get some of the grease and oil off before blasting/painting.
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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 03-11-2021, 09:19 PM   #12
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Re: '78 GMC SC 454/T400 long to short bed build

after soaking in EZ Off oven cleaner for 2 days, I got a chance to power wash some of the greasier front end parts this evening...sprayed on a little Gibbs to slow the flash rust on the machined surfaces...the Prothane control arm bushings showed today too...tomorrow press in the new MOOG ball joints...
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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 03-13-2021, 08:41 AM   #13
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Re: '78 GMC SC 454/T400 long to short bed build

I got off work a little early yesterday and finally finished stripping down the front frame...got the brake/fuel lines off...got the steering gearbox off and the master cylinder/booster as well...goal this weekend is to finish cleaning the frame and paint it as well as media blasting a lot of the smaller parts and painting them
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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 03-13-2021, 09:12 PM   #14
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Re: '78 GMC SC 454/T400 long to short bed build

Got the new MOOG ball joints pressed in the LCA's....also blasted and painted lots of small parts....tomorrow final clean/paint the front frame and then it's on to installing all the new parts!
Attached Images
  
__________________
'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 03-14-2021, 09:56 AM   #15
LT7A
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Re: '78 GMC SC 454/T400 long to short bed build

It's looking good. You're making quick work of it.
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Old 03-14-2021, 12:01 PM   #16
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

Thank you. I try to do a little bit each day so things keep moving along.
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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 03-14-2021, 05:36 PM   #17
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

finally got the front half of the frame cleaned/scuffed/painted today...it's almost time to throw a bunch of new parts at this thing
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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 03-16-2021, 07:40 PM   #18
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Re: '78 GMC SC 454/T400 long to short bed build

the view you have laying under the cab sanding the frame for paint....also, I've decided not to paint the bottom of the cab...I love the original red primer and overspray...there is so little rust...I'm just going to coat it with Gibbs Brand and leave it as is... not hiding anything on this clean ass truck
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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 03-19-2021, 10:33 AM   #19
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Re: '78 GMC SC 454/T400 long to short bed build

love the progress!
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Old 04-07-2021, 08:09 AM   #20
LT7A
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Re: '78 GMC SC 454/T400 long to short bed build

You do very nice work. Very clean installation.
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Old 04-10-2021, 05:41 PM   #21
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

Thanks guys! Yes, this cab is soooo clean...
__________________
'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 04-15-2021, 07:00 PM   #22
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

ok, got some more brake work done...specifically finished running the new InLineTube hard lines front and rear...new brake booster and master cylinder installed...
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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 04-15-2021, 07:02 PM   #23
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

next up, the big block engine stands and new mounts installed...
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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 04-15-2021, 07:06 PM   #24
superchevy
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Re: '78 GMC SC 454/T400 long to short bed build

now, the fully restored a/c evap box ( from Tbe Parts Guy on eBay) could be installed...I used ac duct putty from Home Depot to seal the box against the firewall... you can see how I had to roll it out and set in the grove of the box...
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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 04-20-2021, 08:10 AM   #25
2003z06
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Re: '78 GMC SC 454/T400 long to short bed build

So clean. Love the progress. What are you using to paint the frame and suspension parts?
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