M Code 531 Upgraded suspension SO531

[Pogel]

I have a 63 Kombi with some great extra options including 531, which I believe is an upgraded suspension. Is there anywhere which explains what the upgrade includes? Is it more than stiffer springs, like beefed up shocks? Thank you.

[Eric&Barb]

[Pogel]

Thanks

[EverettB]

There are heavy duty shocks but I think you would have M-Code 106 if those were used too:

Some pics:

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[Pogel]

Great information, I’ll see if I can get any marking off my shocks.

[von_hansel]

[Lind]

Back in the '90s when I was first researching M-codes, before you could just look up a list on the internet, I had a notebook with a list of all the M-codes which I knew at that point. I forgot to bring it along when I want to a junkyard in LaGrande, Oregon, which was a few hours from home. There was a fairly stripped out split bus there that had M531. I couldn't remember the M-code off the top of my head, so I looked all over the bus to see if I could find something different. Seeing nothing out of the ordinary, I plucked whatever small items were left on the bus including the M-code plate. When I got home, I looked it up, and realized that it was heavier rear suspension, and the transmission was still in the bus, so it still had the torsion bars. I wasn't about to make a special trip for just them, so I figured I would just get them the next year when I went through the area. Of course when I went back it had been crushed. Years later, I got a '64 standard with that M-code, so I switched out the torsion bars before I sold the bus. The torsion bars are the same diameter as regular torsion bars. They are painted red, but I have seen others that were red which certainly didn't have that M-code.

I would think that the torsion bars would have a bigger diameter to be stiffer but those were the same diameter. The softer ambulance torsion bars are a smaller diameter. The torsion bars have the M-code of 140 in the parts list, but the parts list doesn't say what is different on them, just that they are for a firetruck. Maybe the M-531 is a grouping of M-140 and M-106. I looked in a few places and I wasn't able to find any other info on M531.

I have the torsion bars out of the M531 bus, and I have some NOS M-106 shocks, and I will put the package on one of my buses at some point that I am loading up with as many M-codes as I reasonably can just for fun. I should probably be able to get a couple dozen M options onto it.
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