[jwcnj45]

I chopped the top on my 48 F1 about 9 months ago. You didn't say what type of a truck you are going to chop. I took 31/2" out of my top. I did mine by cutting the roof into four sections and then adding filler sections to fill the gaps left when the lid is lowered. The shape of the cab will ultimately determine the cuts that you will make. If it is straight up and down like a Model A you might only have to remove the desired amount out of the pillars and doors without cutting the roof apart and adding metal.If you have a sloped cab such as mine was you will either have to cut the roof into sections or slant the posts in. Actually you might even have to do a combination of both. Hope I didn't confuse you.