Frame Rails Project

Fred Scigliano said
The frame rails are made of high strength steel, and would think as far back as 1970.
Do not over weld on the frame it will weaken it.
Not sure if you have to section any part of the frame and you probably know that already but just a heads up.

Nope. Welding on the frame rails is fine, they are not high strength steel, and the factory welded on them plenty.

Bampy said
I am a new member to the Mopar community, and just got my first hot rod with four wheels. a 1970 dart swinger 340 four speed H code. will be placing on a rotisserie and attempting to change out the frame rails any and all tips are greatly appreciated.

You don’t want to change out the rails on a rotisserie. How would you support the car on the rotisserie?

You want to put the chassis on a frame table (ideally), or at least set it up so that it’s level. Then you can check all the diagonals against the factory chassis specs. If you don’t have the factory chassis specs you can download the factory service manuals at mymopar.com.

Bracing the chassis before you remove and replace the rail is good, but you still have to measure everything before and after to do it right.