Boxing a frame

Discussion in 'Race car chassis tech' started by Dragdoc, Nov 9, 2018.

  1. Dragdoc

    Dragdoc Well-Known Member

    5AEC811F-422C-4C80-BAB6-301B4163D97E.jpeg 40970E13-0BC7-49BA-8C57-5EF77C7EDA4A.jpeg 3CA65E45-DBBB-4CA3-B38D-0FE928D3EF50.jpeg Hey gang, I will be boxing the C channel in my 72 Lark, in addition to other frame mods. Keeping a dead stock interior so no cage, and 600 hp from a 462 will be rough on a stock frame. ABC plates are simple, Hellwig seems overly complicated. I started playing with some scrap left over from scratch building hot rod frames. Cheaper than either “kits” and probably stronger!

    Two design ideas, both use a nice long piece of rectangular eighth inch wall stock.

    One, a 3 x 1.5 oriented vertically would close up the open face and essentially be like two boxed rails together. Just clears rear foot wells and avoids dealing with the center body mount. Pretty easy to cut the ends to extend along the factory boxed areas of the frame. Sorry, no visual

    Second, a 2 x 3 in at an angle kinda creates a slope similar to the convertible frame. Kinda creates a box within a box, leaves a great space to route fuel and brake lines. But would have to monkey with sleeving that body mount or create another. End cuts get more complicated but could finish off with smaller plates transitioning into the factory boxed areas.

    Which would you do...or any other ideas?
     
  2. sailbrd

    sailbrd Well-Known Member

    No new ideas. I did the ABC kit. Easy, it works. Sounds like you have the skill to mod up your own. I thought about adding some square tubing the frame curve at the front to close to the lower rear control arm mounting point at the back. But Tony at ABC did not think it was worth it. We did re-weld all of the all the of the factory welds. They did not seem generous enough to me. Made a big difference. Also did all new poly body bushings.
     
  3. sailbrd

    sailbrd Well-Known Member

    At this point pull the frame out. It's not that hard. IMG_20161013_114057179_HDR.jpg
     
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  4. sailbrd

    sailbrd Well-Known Member

    Your frame looks to be in better shape than mine was. It was nice and straight but the rails need a little help. IMG_20161028_150013966.jpg IMG_20161028_150013966.jpg IMG_20161028_150013966.jpg IMG_20161028_133058614.jpg
     

    Attached Files:

  5. Dragdoc

    Dragdoc Well-Known Member

    Yes, the frame will be rolled out from under the body soom enough. Ive just been under the car eyeballing the possibilites.

    I plan to weld any factory deficiencies and plate up the lower control arm bracket. Ive seen the rear crossmember boxed up in front of the coil spring pocket. And a few other gussets around the rear X member.

    Did you build a frame jig? Those large rails that you clamped to?
     
  6. sailbrd

    sailbrd Well-Known Member

    Frame was really true despite all the waves on the bottom of the rail. So all I did was take a nice chunk of 2x3 square tube and c clamped it to the bottom of the frame. Took some more c clamps and used those to draw the bottom of the frame down to straighten it. Problem was that when you loosed the c clamp the metal wanted to spring back. Solution for me was to make those those blocks you see out of 3/16 mild steel and weld them in. Then tacked the ABC pieces in. Then I took to a friend of mine that really knows how to weld. The tab you see in finished view is the mount for the crossmember. We narrowed the stock crossmember and use the stock crossmember frame mounts.
     

    Attached Files:

  7. B-rock

    B-rock Well-Known Member

    What ever came of this? Im looking to box my 65 frame this weekend. Looking at all the options, 3" C channel, 3" square tube? 3/16 flat plate?
     
  8. sailbrd

    sailbrd Well-Known Member

    Powder coated the frame and put it back together. Much tighter now.
     
  9. B-rock

    B-rock Well-Known Member

    What method did you use to box the frame
     
  10. sailbrd

    sailbrd Well-Known Member

  11. StfSocal

    StfSocal Well-Known Member

    Unrelated question but what color is that?
     

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