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Author Topic: 1980 GMC 42' Class A  (Read 5464 times)

rexwalker

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1980 GMC 42' Class A
« on: October 16, 2016, 07:54:29 PM »
I am looking for any and all info I can find on a motorhome I just bought. Its 42'-6" long, the title says 1980 GMC. It has a Detroit Turbo Deseil engine at the back.
I have search high and low and can't find anything on it. It has air brakes and 1 slide out that may have been added.
Bed is in back. Shower is in front of bedroom with a closet opposite the shower.
entry door is at the very front and the passenger seats are behind the driver.

I am looking in particular for wiring, battery arrangement, info on generator, water/utility tank sizes. I have been told the propane is a 100 gallon. what size fuel tank would help also.

Thanks



Gary RV_Wizard

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Re: 1980 GMC 42' Class A
« Reply #1 on: October 17, 2016, 09:19:42 AM »
GMC did not build motorhomes that size, so what you undoubtedly have is a conversion of a GMC bus (motorcoach). Somewhere on the body there should be some other name besides GMC, to indicate who made the conversion (unless it was a privately done custom conversion).

Finding any info on it is likely to be impossible, but bus conversion owners often share info and ideas. In addition to the Bus Conversion board on this site, you may find help at sites like these:
Bus Conversion Magazine:  https://www.busconversions.com/
Bus Nuts Yahoo Group: https://groups.yahoo.com/neo/groups/all-bus-nuts/info
Gary
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Frizlefrak

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Re: 1980 GMC 42' Class A
« Reply #2 on: October 17, 2016, 11:44:45 PM »
Got a pic of it?  I'd love to see it.
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Utclmjmpr

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Re: 1980 GMC 42' Class A
« Reply #3 on: October 18, 2016, 01:33:50 PM »
 Look in the compartment under the drivers seat for the model number,, they did not have VIN numbers,,it will be stamped on the frame.. If it is turbo'ed the engine will be an 8V92 or a 6V92 two stroke detroit..>>>Dan
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rexwalker

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Re: 1980 GMC 42' Class A
« Reply #4 on: October 19, 2016, 06:40:25 AM »
Here are some pictures.

Utclmjmpr

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Re: 1980 GMC 42' Class A
« Reply #5 on: October 19, 2016, 07:23:00 AM »
  That is a Inter City coach with the 6V92TA engine, probably set up to 350 horsepower. The main problem is the city gearing is too low for over the highway travel and NO storage underneath the bus,,,They are the sleekest/sharpest  looking of all the bus models
GM made.. Higher gears are next to impossible to find and with the standard gears your mileage will be terrible for hwy use.

Go to Bus Conversion Magazine bulletin board and talk to Geoff,, He has one and is a Detroit/GM specialist..>>>Dan
Vary rare American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #6 on: October 19, 2016, 09:36:45 AM »
Thanks a lot.
it only has 8,020 original miles on it.

Utclmjmpr

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Re: 1980 GMC 42' Class A
« Reply #7 on: October 19, 2016, 02:01:10 PM »
+  The general model description (in that world) for that bus is an RTS.>>>Dan
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The difference between intelligence & stupidity is: intelligence has it's limits
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grashley

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Re: 1980 GMC 42' Class A
« Reply #8 on: October 19, 2016, 07:16:36 PM »
THIS FORUM IS AMAZING!!!!

Post a picture of an unknown model motorhome, and within a day, somebody here tells you all about it, including where to get specific model help!!  I have seen it before, and I am still amazed!!
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kdbgoat

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Re: 1980 GMC 42' Class A
« Reply #9 on: October 19, 2016, 07:44:09 PM »
This site is amazing most of the time. Now if someone can help Muddy with his slide leak problem. ...
I know you believe you understand what you think I said,
But I am not sure you realize what you heard is not what I meant

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Utclmjmpr

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Re: 1980 GMC 42' Class A
« Reply #10 on: October 19, 2016, 07:59:47 PM »
 I would not take that mileage to the bank,,an RTS was only purchased by cities for inner city transport,, after reaching its useful life in that regard they are normally auctioned off and eventually reach the public domain or the scrappers.  Many were used by the military and did not get into high mileages , but never that low.>>>Dan
Vary rare American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.

Utclmjmpr

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Re: 1980 GMC 42' Class A
« Reply #11 on: October 19, 2016, 10:15:45 PM »
  Rex,, your Detroit engine is a V6 552CID two cycle with a turbocharged and aftercooled induction system,,it uses ONLY straight weight oil, (Delo 100 straight 40 weight).. Any modern multi grade oil will cause (over time) an increase in oil consumtion..
You may be challenged to find a straight weight oil when you need it so stock up when you do.  That engine does NOT like to be "lugged", so when you feel it struggling up a grade gear down and let the engine spin, DO NOT OVERHEAT THIS ENGINE,,,it will get expensive quickly.. When overheated they will crack the heads quicker than you realize..>>>Dan
Vary rare American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #12 on: October 20, 2016, 06:16:39 AM »
ok, I need help on this. The guy I bought from had a contraction that went on the batteries, but he got from a guy that drove it from MO to TX and they put it on electrical hookup.
It appeared to be a item that connect batteries in series for 24 volt. But as we looked at it, it was solid in the middle which would have been a dead short. He put two 12 volt batteries in parallel.

Does anyone know if those two batteries are series or parallel? 12volt or 24 volt. I assume those are the house batteries, the other (1) 12v battery seems to be the one that cranks it.

There is a (2) gauges on the dash one appears to be 12V system showing greenbar between 12-16 the other a 24v system showing green between 24 and 30.http://www.rvforum.net/SMF_forum/index.php?action=dlattach;topic=99670.0;attach=107756;image
« Last Edit: October 20, 2016, 06:18:27 AM by rexwalker »

Utclmjmpr

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Re: 1980 GMC 42' Class A
« Reply #13 on: October 20, 2016, 09:49:46 AM »
  That unit was standard with a 24 volt system,,more than likely the "house" side has been wired for 12 volts to make the RV type off the shelf items commonly used in RVs, work ... The starter and probably the bus heating system, and things like dash lights, headlights, and various "bus" systems was left 24 (and there may be little left to worry about) You are going to have to work out the systems with a VOM to determine how it was done, (there is no "standard" way,it depends on how and what the converter wanted at the time). At no point should these two systems "come together" Vary seldom have I seen a converted coach sold with any schematics or plumbing data included. Your coach (from the pictures) looks like a pro conversion and nicely done, BUT,, it will be a learning curve for you..>>>Dan ( The starter is easy to access, so look it over to determine if it has been replaced with a 12 volt starter..You will also need at least two group 31 batteries to start that engine, particularly when cold..
« Last Edit: October 20, 2016, 09:55:39 AM by utahclaimjumper »
Vary rare American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #14 on: October 20, 2016, 09:52:36 AM »
Thanks

Utclmjmpr

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Re: 1980 GMC 42' Class A
« Reply #15 on: October 20, 2016, 03:56:20 PM »
Vary rare American Tradition 38TT/330 turbo Cummins
Jeep liberty 4 down
72 VW Baja 4 down
Cedar City, Utah
USAF vet. 59-63
The difference between intelligence & stupidity is: intelligence has it's limits
      Albert Einstein.

edjunior

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Re: 1980 GMC 42' Class A
« Reply #16 on: October 20, 2016, 06:00:12 PM »
Holy crap Dan.  You are the man.  I think you have made a serious new friend with Rex!  Great job.

Very cool looking coach by the way.  Can you post some innie pics?  That is quite a unique piece of RV.
Ed.....KF5INW
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Back2PA

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Re: 1980 GMC 42' Class A
« Reply #17 on: October 20, 2016, 06:37:40 PM »
Very cool looking coach by the way.  Can you post some innie pics?  That is quite a unique piece of RV.

X2. Very cool
Scott
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rexwalker

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Re: 1980 GMC 42' Class A
« Reply #18 on: October 21, 2016, 01:49:34 AM »
Some interiors. The center piece in the bedroom comes out for a skylight.
« Last Edit: October 21, 2016, 02:38:43 AM by rexwalker »

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #19 on: October 21, 2016, 02:27:33 AM »
Thanks for all the help and great advice.

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #20 on: October 21, 2016, 02:29:51 AM »
Another inside.
« Last Edit: October 21, 2016, 02:50:59 AM by rexwalker »

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #21 on: October 21, 2016, 02:37:02 AM »
Box near driver seat.

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #22 on: October 21, 2016, 02:45:55 AM »
one more inside

rexwalker

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Re: 1980 GMC 42' Class A
« Reply #23 on: October 21, 2016, 02:50:34 AM »
I did find one more when the guy I bought from had it out at the lake with slide out.

Back2PA

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Re: 1980 GMC 42' Class A
« Reply #24 on: October 21, 2016, 06:45:21 AM »
That is one beautiful coach you've got there
Scott
2014 Montana High Country 343RL (38')
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rexwalker

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Re: 1980 GMC 42' Class A
« Reply #25 on: October 21, 2016, 07:29:51 AM »
Thanks. I am trying to get it back up to speed. People have just been living in it parked for years. Guy I got from parked for 3 years, he got from his boss and that person parked for 9 years. Guy I got it from never used on the road, the guy he got from drove it from MO toTX and backed it into the lot area and hooked it up for the guy. When I bought, I thought it was road ready, but no driving lights worked. I have all new tail lights in a box. I need to get all working so I can get safety inspection, then I can register and get tags. I don't even know how to start it, or get anything to turn on. Guy I bought from been away for a couple weeks. He is going to come over and give me a run down on it. He showed me once, something about flipping couple switches at the back, then a switch in battery compartment, then can go to driver seat and turn knob to run and hit a starter button. I started it up at the lot he was on. later on after I exchanged money he drove over to my work lot. That is where it is sitting till I get all the lights, blinkers, ect..working. It has some issues, but for $7k I think I made a good deal and I was assured the mileage was original miles.
« Last Edit: October 21, 2016, 07:34:06 AM by rexwalker »

vinceherman

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Re: 1980 GMC 42' Class A
« Reply #26 on: October 21, 2016, 07:48:34 AM »
Beautiful coach!

Rex, I am not familiar with the details of how to read the tire dates.  I hope that someone who does will post here.
But even if the old tires have great tread life left, they may not be safe for the road.
Tires have a limited life span when unused, and after that time have a greater chance of failure.  Many people buy old RVs with great looking tires but then find that they need to replace them all for safety.
Just a heads up for you.
Vince, Marion(dw), Rachel(mil) and Dublin(pup).
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rexwalker

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Re: 1980 GMC 42' Class A
« Reply #27 on: October 21, 2016, 08:08:30 AM »
Thanks.
I do know a remodel was also done in 2005. It has a Texas inspection sticker that says "ready for inspection" 04 05, never seen that before, but I am assuming maybe some new tires was installed, but those could have been when the other guy got it, so they were 9 years old when he had some work done on it. I do need to see how to read and understand the dates. I know 3 years ago it was driven from MO to TX. I was told the 1st hundred miles was terrible, till tires got good and heated up, then they say it drove like a dream. I am actually going to drive 150 miles to my property and use for couple years while I build a house. Work on it little at a time and then retire, and get ready to use it on the road.
« Last Edit: October 21, 2016, 08:18:18 AM by rexwalker »

kdbgoat

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Back2PA

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Re: 1980 GMC 42' Class A
« Reply #29 on: October 21, 2016, 09:53:50 AM »
for $7k I think I made a good deal

Wow
Scott
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Frizlefrak

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Re: 1980 GMC 42' Class A
« Reply #30 on: October 21, 2016, 09:51:33 PM »
for $7k I think I made a good deal

For $7K, you got a screaming deal.
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rexwalker

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Re: 1980 GMC 42' Class A
« Reply #31 on: November 04, 2018, 09:04:34 AM »
I had a brake air hose pulled off, it broke a plastic part on the height controller. Does anybody know where I can get that part? I am trying JB Weld, but don't think that's going to work. On another note, I selling bus for $6500..Thanks

Lou Schneider

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Re: 1980 GMC 42' Class A
« Reply #32 on: November 04, 2018, 02:44:52 PM »
  That is a Inter City coach with the 6V92TA engine, probably set up to 350 horsepower. The main problem is the city gearing is too low for over the highway travel and NO storage underneath the bus,,,They are the sleekest/sharpest  looking of all the bus models
GM made.. Higher gears are next to impossible to find and with the standard gears your mileage will be terrible for hwy use.

Go to Bus Conversion Magazine bulletin board and talk to Geoff,, He has one and is a Detroit/GM specialist..>>>Dan

Low gearing is not necessarily true.  Golden Gate Transit had a fleet of those that ran highway speeds along Highway 101 between Santa Rosa and San Francisco for decades.

On a clear road they'd top 75 MPH.

Verify the 12 volt system is working properly.  If I remember right, the GGT buses I rode had dual 12 volt/24 volt electrical systems.  24 volts ran the starter, all of the headlights, etc. were on the 12 volt system so they could use standard bulbs.
« Last Edit: November 04, 2018, 02:53:00 PM by Lou Schneider »