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Old 09-27-2022, 11:14 AM   #1
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8.1 RV vs Truck Differences

What are the real differences between a 8.1 in a class A vs a GM Truck? Is it internal or external. I know some 2003 have a manual xmsn and others are allison automatic. Please be specific as you can or show me a spec sheet. Is there a in-depth service manual and parts manuals available. I have found several 8.1 but most say not for RV applications. If you can please explain.
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Old 09-27-2022, 01:47 PM   #2
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A start might would be here - workhorse.navistar.com/Default.aspx?tabid=574 for MoHo’s.

But I highly doubt there is anything different internally between truck and MoHo use.

This site might also give you some insight - it appears most differences are external to affect interchangeability - https://ck5.com/forums/threads/l18-8...thread.308019/
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Old 09-29-2022, 08:06 AM   #3
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MrMark (great name) thanks for the excellent link. What a great reference for the 8.1L.

Mark B.
Albuquerque, NM
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Old 09-29-2022, 09:38 AM   #4
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8.1

Could you be specific about this 8.1 reference material?
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Old 09-29-2022, 01:06 PM   #5
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Quote:
Originally Posted by fayjim2 View Post
Could you be specific about this 8.1 reference material?
What are you asking? About my first reference document, or my 2nd? Or something altogether different?
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Old 09-30-2022, 09:59 AM   #6
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I posted the entire Workhorse Service Manual on my website: HERE
You can view and download the files but be aware that some of the files are huge.
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Old 09-30-2022, 11:16 AM   #7
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Doesn't appear to be publicly accessible:


403. That’s an error.

We're sorry, but you do not have access to this page. That’s all we know.


Mark B.
Albuquerque, NM
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Old 09-30-2022, 02:57 PM   #8
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Quote:
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I posted the entire Workhorse Service Manual on my website: HERE
You can view and download the files but be aware that some of the files are huge.
Ok, you should be good to go. I gave the Workhorse folder public access in my Google Drive account. My wife was able to open files now. Anybody with the link can open the files. I just created this website since the old google sites was shut down a year or two ago.
Happy Trails,
Bill
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Bill & Helen & Bella (Yorkie/Chihuahua Mix)
Last of the Chieftains, 2004 39T, W22, UP tune, Banks, Koni's, Safe-T-Plus, SMI brake
2017 Lincoln MKZ Hybrid towed 4-down, 2008 Jeep Wrangler JK
https://www.irv2.com/attachments/signaturepics/sigpic23522_1.gif]
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Old 10-01-2022, 09:49 AM   #9
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Duner

I.m no computer person. When I tried to open it said it was to large to view,if you have a suggestion please tell me. Is there a way to just have the 2003 engine section. Thanks jim
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Old 10-01-2022, 11:18 AM   #10
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If I were you.. i would get block numbers off pass side top of block.. and then find the generation of block you have.. after your own research you may find.. that as long as the yrs that generation of block was used they will all fit.. then you use your stock rv ecm and top end hardware.. great resources would be local library and gm/Chevy big blocks.. as long as you stay wih in generation of block you have.. it will fit fine.. yes Chevy changes programming of ecm to match rv versus truck but blocks are same.. as long as generation is same.. that is just imho.. if you are still looking for answers.. suggest you hit the local library on gm/Chevy engines..
Ofcouse there is the labor to deal with.. it's way more than price of engine.. then the emotions if you plan to keep rv..
Another idea.. might be.. ask shop. If they have local engine rebuilders they use.. and having rebuilt locally..
Good luck and keep us posted
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Old 10-01-2022, 11:25 AM   #11
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Oh.. I should have suggest you talk to several salvage yards.. these people are often overlooked.. but if you are kind.. and take in some food.. you may be surprised at the information they have.. they really are good people and smart..
Good luck and keep us posted
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Old 10-01-2022, 02:01 PM   #12
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Quote:
Originally Posted by fayjim2 View Post
I.m no computer person. When I tried to open it said it was to large to view,if you have a suggestion please tell me. Is there a way to just have the 2003 engine section. Thanks jim
It would be a lot of work to sort out just the engine info.
Instead of viewing in your browser, select download. Depending on your internet speed, it could take a couple of minutes or hours. Start the download of the one really big main file and then go do something else if it's going to take an hour or more. But once it's downloaded, then use Adobe Reader to open the file and you're good to go.
Here's a view of the file sizes so you know how much you're trying to download.
All the electrical documents are less than 3 meg, so there should be no problems there.
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Last of the Chieftains, 2004 39T, W22, UP tune, Banks, Koni's, Safe-T-Plus, SMI brake
2017 Lincoln MKZ Hybrid towed 4-down, 2008 Jeep Wrangler JK
https://www.irv2.com/attachments/signaturepics/sigpic23522_1.gif]
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