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that might explain some of the reinforced cabs that I have seen that didn't have ring mounts or appear to ever had one, but it looked just like the gun truck cabs that I looked at. I have often wondered why they didn't make all the cabs reinforced from the beginning.

Does anyone have a drawing of the hardened cabs or at least a way to tell them from the standard cab?

stainless steel? guess I should have put it "new " or replacement cabs, yes I know that not all M939 cabs are stainless steel but I was told that the "NEW" cabs are.:roll:

and has anyone heard the new 939 cabs are made of stainless steel?

Not wanting to change everything just body parts and keep my drivetrain, the 939 cab is 10" wider than 809 so maybe move seat a few inches?

"The M939 series was originally designed as an upgrade package for the M809 series trucks." from 5ton faq :cookoo:So how hard would it be to change the cab and front out from 809 to 939? And yes I think I would like to try, I have almost new 818 but I am 6'8" and would like to shift without...