I was thinking of changing my roof manny years ago as I found a cab that had the corner windows but decided not to mess with what I had .The cab has joints as you are most likely aware of on the side of the windshield and they used lead to body fill .at the back there are bolts but also welds .It may be worth it but I have seen some good work at taking out dents also .My roof had a few dents just above the passenger side of the window and I had good results in using a slapper to coax it mostly out .


1954 Canadian GMC 9300
"The Journey"
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