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Originally Posted by dstankov
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The rear area/axle is mounted to a sub-frame assembly which is bolted to the main frame rails with I believe nine bolts (I saw 3 on the side, 3 on the bottom and I assume there are 3 on the top). This joint appears to be in the area, forward of the axle, where the air bag should be mounted, or very close to that area.
Now, I'm not sure if this layout is specific to the 22.5 inch chassis.
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What you describe is very interesting to me because I've never seen a truck or large motorhome utilize a subframe to mount the rear axle. I've seen a few that were converted to full rear air suspension like those used on semi trucks, but the entire air suspension including trailing-spring-bar-mounts were bolted directly to the frame rails.
Dave, can you tell if the subframe looks like it came that way from Ford or is it something that Thor either added or had some other company add for them? And can you tell why it was likely added?
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