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    Thread: The GMC Motorhome: way ahead of it's time

    1. 03-22-2020 12:50 PM #76
      Quote Originally Posted by patrikman View Post
      But why? The big block Olds and TH425 are literally bulletproof and you can buy parts anywhere for cheap.
      Probably because the person who asked isn't from North America where that engine and transmission may be somewhat available with some level of aftermarket support.

      How well supported are the Olds engines anyhow? Chevrolet, sure, but Olds? And there's not really an abundance of vehicles still around with the front-drive longitudinal TH425 transmission. Looks like the TH425 was used until 1977, then replaced with a lighter-duty TH325 (no idea if that would be up to the task of lugging a motorhome around), then that had an overdrive added in 1982, and discontinued in 1985.

      For someone from Norway ... I think you're better off with a European-sourced motorhome.

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    3. I’m not a loser. I’m a winnah!! patrikman's Avatar
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      03-22-2020 04:47 PM #77
      Quote Originally Posted by GoFaster View Post
      Probably because the person who asked isn't from North America where that engine and transmission may be somewhat available with some level of aftermarket support.

      How well supported are the Olds engines anyhow? Chevrolet, sure, but Olds? And there's not really an abundance of vehicles still around with the front-drive longitudinal TH425 transmission. Looks like the TH425 was used until 1977, then replaced with a lighter-duty TH325 (no idea if that would be up to the task of lugging a motorhome around), then that had an overdrive added in 1982, and discontinued in 1985.

      For someone from Norway ... I think you're better off with a European-sourced motorhome.
      I think you’d be surprised as Olds parts should be readily available anywhere you can find either a) a GM dealership network b) parts for vintage Ford and Chevy and Mopar. The reason for the transmission change was late in the run they switched for a 455 to the 403. Is there an abundance of them around? No. Can you get parts? I’m almost certain you can find most things with a bit of effort either NOS or repro.
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      03-23-2020 05:42 AM #78
      Quote Originally Posted by perdaniel View Post
      I wonder if a more modern VAG FWD drivetrain would fit in the engine bay and withstand the rigors of moving such a heavy thing. Maybe a TDI out of an A8?
      A better option would be whatever the top power train from a Ram Promaster/ Fiat Ducato (spelling?). That drivetrain at least is used in an HD application.
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    5. 03-23-2020 08:46 AM #79
      Quote Originally Posted by newusername View Post
      A better option would be whatever the top power train from a Ram Promaster/ Fiat Ducato (spelling?). That drivetrain at least is used in an HD application.
      ... but it's transverse, and I don't know how nicely that would play with the GMC motorhome's original longitudinal powertrain layout.

      An older Audi longitudinal V6 TDI might have a chance of physically fitting, but you will be on your own for figuring out driveshafts and integrating the electronics.

      A GM 6.2 / 6.5 V8 (not Duramax!) will go in but is no small feat: https://www.youtube.com/watch?v=PCoeQ5I6Bwg

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      03-23-2020 01:54 PM #80
      Can't recall if this link has been shared, but if not...if you are afflicted with even a small amount of want for one of these, apologies in advance.

      http://www.gmcrvforsale.com/category/united-states/

      I spend too much time perusing this, and have found some FS that are dangerously close. It's a good thing I have zero actual need for a motor home (other than I could live in it once I was kicked out of the house for buying it. But if I'm doing that, I'm going for a BlueBird Wanderlodge.)

    7. Member 2000JettaGLXVR6's Avatar
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      03-23-2020 02:22 PM #81
      There's a great Facebook group with a ton of info https://www.facebook.com/groups/classicgmcmotorhomes/

      My friends are supposed to ship theirs to China, then drive it across South Korea, Mongolia, Russia and back to China. Coronavirus has them reconsidering.

    8. Member atomicalex's Avatar
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      03-23-2020 03:08 PM #82
      Quote Originally Posted by numbersix View Post
      can't recall if this link has been shared, but if not...if you are afflicted with even a small amount of want for one of these, apologies in advance.

      http://www.gmcrvforsale.com/category/united-states/

      i spend too much time perusing this, and have found some fs that are dangerously close. It's a good thing i have zero actual need for a motor home (other than i could live in it once i was kicked out of the house for buying it. But if i'm doing that, i'm going for a bluebird wanderlodge.)
      not looking not looking!!!!
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      03-23-2020 03:20 PM #83
      Quote Originally Posted by atomicalex View Post
      not looking not looking!!!!
      ...but maybe looking, Kat?

    10. Member tip's Avatar
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      03-23-2020 10:43 PM #84
      this thread needs more pics

      @saugster_pnw

    11. Member l88m22vette's Avatar
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      03-24-2020 11:37 AM #85
      Just looked at some of the recent ones listed, it is very tempting to hold out for a cheap one since they range from $30k+ for a creampuff to definitely less than $10k for a runner/project. I'd love a new 8.1 with a modern trans, upgraded brakes, and some other fancy crap, we keep looking at campers but so many are janky and not worth the effort (or price).
      Last edited by l88m22vette; 03-24-2020 at 11:43 AM.

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      03-25-2020 07:17 PM #86
      My parents have been on again, off again talking about getting a camper.

      I suggested one of these.
      Quote Originally Posted by zukiphile View Post
      There is an area of a normal brain that lets the owner know the object works and needs to be left alone. Not all of us have it. It is like being colorblind.

    13. 03-25-2020 07:56 PM #87
      I've always loved these and browse that classifieds page every once in a while.

      This belongs here:
      https://www.motor1.com/news/364339/c...motorhome-6x6/
      Last edited by NoGrip61; 03-25-2020 at 08:02 PM.

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      03-25-2020 08:06 PM #88
      My Dad had one of these GMC motorhomes. He wasn't mechanically inclined at all and always had the thing at some shop. Total money pit. He redid the interior, I'll try to post some pics here.
      Last edited by mitanokaseifu; 03-25-2020 at 08:10 PM.

    15. I’m not a loser. I’m a winnah!! patrikman's Avatar
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      03-25-2020 08:58 PM #89
      Quote Originally Posted by tip View Post
      this thread needs more pics

      spotted today on my lunch break

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    16. 03-25-2020 09:26 PM #90
      Quote Originally Posted by NoGrip61 View Post
      Oh. My. God.

      I just showed this photo to Mike. Thank you for getting us hooked on our next project. (He owns a RevCon, in case you didn't know.)
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      03-26-2020 09:06 AM #91
      582ci huffed V8? 6x6 with sidepipes? Holy. Lord.

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