Fixin frame rust

[Sierra4x4]

Very soon i plan on sanding down my frame and painting it. There are some rust spots but only 1 'bad' one. I havent really looked at it but its some kind of support near the cab. Its not really bad but i was wondering should i just take it out and weld it a replacement? What is that stuff you can apply to rust and it makes it hard as steel again?

[83CHEVY]

POR15

And you should not have to cut out a piece of frame rail.  I can't imagine that you have more than just surface rust on steel as thick as the frame rails.

Mike

[Sierra4x4]

ITs not actually the frame its like a support bracket on the frame. Seems like the frame parts are okay but all the members connecting the frame are the worst.  But thanks!!

[Blazin]

Sounds like the crossmembers to me. You shouldn't weld crossmembers to the frame. The entire frame structure needs to move and flex a little bit. Bolting is the best, the factory uses rivits because its fast and less expensive. You can buy cross members from the junk yard and I think you can still get them from GM.