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Old 04-25-2007, 06:07 PM
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Tubbing rear with original frame rails?

Hi new guy here, I've been working on my 55 Pontiac, tubbing the rear end. I planned on moving the rear frame rails inward and mounting the leafsprings inside the frame rails. Where I cut I welded in a new patch piece and was going to box the rear frame rails in.
I'm at the point now that i'm not real sure on the whole notching thing, has anyone else done this with good results?
I have a identical parts car I was thinking of cutting the frame rails forward of the front leaf spring mount maybe 1ft and use the front spring thru bolt for referance. This way I wouldn't have to use my piecut/repaired frame rails and still use the leafsprings on the inside of the frame . I would cut the frame rails of the doner car and swap sides onto my car and box them in using the section of the original frame to help box in.. I was also going to add in a crossmember in front of the repair- down the road ladderbar/coilover.
One reason I cut and moved the frame rails was the design of the frame rails the front of the leafsprings is on the outside and the frame contours over and at the back it's inline with the frame rail. I only lost about 1/4" of length where it was rivited to the rear crossmember.
I would love to just buy a rear clip already set up, but my budget doesn't allow that . I'm just building a cheap hot rod , I figured with guys chopping of the front frame rails to put a newer clip on, the same would work for the rear suspension.
I figured with what i've done already i'll have 18" at the axle centerline of wheelwell, With changing the rear frame rails completely i'll add about 3-4".


Any thoughts or input is appreciated.

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Old 04-25-2007, 08:02 PM
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I had a friend with a 66 Vette which had the stock frame rails moved in. Worked pretty slick. You have to decide what you want though. Quick and easy (relative) would be to buy a back half kit and install that. It costs more and it will be obvious to everyone that you modified the car. Using the stock rails might save you some $. Additionally, you can cut and move the stock floor pans. By being careful about the way you do it, you may fool folks into believing it is stock. My friend with the Vette widened the stock rear inner fenders by about 8 inches using fiberglass. Several guys from the local Vette club thought they were GM original.

Moving the springs inboard is one way to go about it. However, The way a lot of 55-57 Chevy (similar but not exactly the same as yours) owners do it is to cut and box the frame so the spring mounts inside the frame rail. Then hang a shackle down from either side of the rail in the back. Gets the spring out of the way but leaves room for the gas tank and exhaust.
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