roof seam sealer how to's an what not? plus tranny linkage.

[lha1992]

Hi all. I have a 1965 c10 I'm gearing towards replacing the roof seam sealer on to prevent future rust an what not from forming. It is cracked pretty bad but luckily no rot yet but being in Seattle gotta act. Anyways what do you guys do when redoing your seam sealer on the roof? Do's an don'ts? What kinda sealer do you use?

Also my truck originally came with a powerglide an auto column from the factory an I'm sealing out the original powerglide for a TH350 an what did y'all do in terms of the shift linkage? Trying to figure something out.

Thanks!