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Old 12-12-2013, 01:01 AM   #1
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78 Dodge Chassis Suspension

I've got a 78 Dodge RV chassis that I think is an M400. The wheels are 8 lug on a 6 inch pattern and are 17.5 inch. I need to raise the chassis and would like to put 19.5 or 20 inch wheels on it in order for it to "look right"; I'm putting a 48 Dodge COE on the chassis and the 17.5's look like rollerskate wheels under it. My question: will the steering knuckles from a M500 fit the M400 front axle, if not will the hub from a M500 fit the spindles on an M400. Regarding the rear axel (which is a dually), will the axels from a M400 and a M500 interchange in order to maintain common lug patterns? Any help appreciated. 360-372-2874.
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Old 12-13-2013, 06:38 PM   #2
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Your question would be better asked in the vintage forums , maybe a moderator will move it over for you .
The bolt pattern on the rear for sure is a function of the brake drums , where the wheel studs are mounted, the full floating axle drives the drum and the drums drive the wheels. So there would be a huge change over on the back , the larger rear drums may only mount to a larger rear end housing. Larger drums , bigger brakes , different backing plates etc.
There are several members who have the older Dodge M/H chassis, I'm sure that one will be along soon with all the info you need.
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Old 12-14-2013, 01:19 AM   #3
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78 Dodge Chassis Suspension

Skip, thanks for your help. I've sort of arrived at that conclusion. I have found a 77 M500 unit locally, if the frame rails are the same width as the 78/78 I might just buy that axel and differential for my unit; a lot of money and work but I need bigger wheels, Thanks again, Jim.
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Old 12-14-2013, 10:22 AM   #4
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Drive shaft may also be required , bigger diff. may use larger U joints.
I'll dig around in the older posts , I have on records for the members name that has all the facts on the older Dodge chassis and re-post his contact info to you.

OK, I got back in time to edit this post.
Member who seems to have the most info on the old Dodge goes by " Dave 78 Chief " you could send him a personal message if he doesn't reply to your post.
If you go to the " Forums " at the top of the home page under the " iRV2 " logo, select " Vintage RVs " from the drop box ; then open " search this forum" and type in " Dodge Chassis " the posts that come up may help.
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Old 12-16-2013, 12:49 AM   #5
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Skip, thanks you're a great help. I'll give the "Chief" a try. Thanks again, Jim.
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Old 12-21-2013, 10:17 AM   #6
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I would think that just changing the wheels would be easier than changing all the hubs and stuff. Some of the custom wheel mfg are now offering direct bolt on Dually wheels for pickups in the larger wheel sizes, 19.5, 22.5 etc. I would contact them and see if you could get them in your bolt pattern for your application. Just a thought.
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