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Author Topic: 1976 GMC Motorhome  (Read 27937 times)

Offline JustinLonghorn

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Re: 1976 GMC Motorhome
« Reply #10 on: Mar 17, 2016, 09:21:40 »
Yes sir, I can definitely dig it.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline Maritime

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Re: 1976 GMC Motorhome
« Reply #11 on: Mar 17, 2016, 09:27:52 »
Signing up.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Online WhyNot

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Re: 1976 GMC Motorhome
« Reply #12 on: Mar 17, 2016, 09:29:12 »
Just what I want, now I'm on the hunt for one.

Looks neat man.
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline luke000

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Re: 1976 GMC Motorhome
« Reply #13 on: Mar 17, 2016, 09:57:28 »
Count me in for the ride!
"Anything free is worth saving up for."
"If the women don't find you handsome, they should at least find you handy."

1986 Yamaha Venture Royale 1300
1974 Honda CB550--SOLD
1982 Yamaha Virago 750

'74 CB550 Cafe Build

'86 Venture Royale Rebuild "Project: Freightliner

'56 DuraTech Sealine "Project: Popcan"

'59 Lone Star El Dorado (BOAT)

Offline SONIC.

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Re: 1976 GMC Motorhome
« Reply #14 on: Mar 17, 2016, 10:11:46 »
Thanks for the support guys I'll try to keep the updates coming.
Justin, your camper was part of my inspiration for this, so at least part of the blame for this crazy endeavor falls on you.


Offline SONIC.

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Re: 1976 GMC Motorhome
« Reply #15 on: Mar 17, 2016, 10:18:32 »
Installment 2:
After getting the dash mostly done I tackled the door panels.
Whoever designed this thing did a great job except for one thing. NO Fucking cupholders. Are you serious?
So I had to redo the door panels to have a cup holder, I didn't want to go through the trouble of fiberglassing:






Beautiful.
These will be covered in the same grey as the dash at some point. Took them to an upholstry shop to have them done after I failed miserably, and after 3 months the guy went out of business and I had to go repeatedly stand at his door until he showed up to get them back as they aren't replaceable. He said "sorry man i just couldn't do them for what I quoted you" "THEN CALL ME AND TELL ME THAT YOU ASSHOLE"

Onward



Offline Maritime

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Re: 1976 GMC Motorhome
« Reply #16 on: Mar 17, 2016, 10:22:00 »
Nice, and way less messy than fiberglass. Glad you got them back too.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Sav0r

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Re: 1976 GMC Motorhome
« Reply #17 on: Mar 17, 2016, 10:27:30 »
Looks like a sweet cupholder. I think I would have added two if I was going through all that trouble.
Sav0r the adventure.

Visit www.chrislivengood.net to get more information on my RD350 dubbed Mia Wallace as well as my other projects and snafus.

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Offline JustinLonghorn

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Re: 1976 GMC Motorhome
« Reply #18 on: Mar 17, 2016, 10:31:51 »

Justin, your camper was part of my inspiration for this, so at least part of the blame for this crazy endeavor falls on you.



Well, I sold that camper to Eric, and he sold it to someone else. Ha.

I am happy to see that you're actually going through with the Reno. Keep up the good work, man.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline SONIC.

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Re: 1976 GMC Motorhome
« Reply #19 on: Mar 17, 2016, 10:31:59 »
After that, I took a break from the dash to do some mechanicals.

The GMC has air ride suspension in the rear. 2 air bags are inflated and deflated individually to control the tilt and height of the rear end.
In stock form it has a tiny tank and a tiny compressor that takes forever to fill the bags to change the level. That wasn't going to cut it becuase well who wants tiny things?
So I yanked all that shit out and built my own compressor setup with a viair 444C and a 2.5 gallon tank. This will allow me to air up tires, tubes, balloons whatever the hell I want, along with run air tools on the side of the road if the need arises. Also it's cool.



The tank runs to a bunch of solenoids that allow me to air up and down from the dash, as well as to sending units for the air pressure gauge in the dash.


Getting it mounted was a bit tricky. The original compressor system is housed in the back in an interior cabinet. It's loud and obnoxious and takes up valuable interior space. So I put this one in front of the passender drive wheel, with soem rearranging of the start battery and a radiator hose, it worked out perfectly.

Here's the pressure gauge

I wanted one with dual needles so I could read both bags at once, as well as with remote pressure sensors so I didn't have to add leak prone plumbing into the cab. It's no fun driving down the road when one air bag looses pressure as you can imagine.

Once that was done and plumbed I started playing with the engine a bit.
When I drove it 3 hours home it wasn't wanting to shift very well. Had to really coax it into 3rd.
Ended up being really simple after a lot of searching, the vacuum modulator was hooked to the wrong vacuum port bu the idiot PO. Once I corrected that it shifted like a dream. And believe it or not this thing is awesome to drive.

Power steering and brakes, cruise control, air ride suspension, quiet as a mouse. It's really mindblowing that this came out of the 70's.

Next up was power. I had read that these things were crazy powerful. Mine would haul me down the road but I certainly wouldn't call it crazy powerful. I almost chocked it up to the fact that all of these are owned by people who would think a prius is "crazy powerful" but i started investigating anyway.
Pulled the engine cover and pushed the pedal to the floor and watched the quadrajet do it's thing. Or not do it's thing. Secondaries never opened. WTF.
Turns out the throttle linkage to the pedal was bent, meaning that when the pedal was on the floor the butterfly was only halfway open.

FUCKING A RIGHT
A test drive later and a bunch of grins and some new burnout marks on the road and she's a whole different animal. Cruises at 75 with no problem. 455 Cubic Inches of Big Block greatness.

« Last Edit: Mar 17, 2016, 10:34:54 by SONIC. »