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I have a '41 ford pickup that I have been working on for the last few years. We put a Mustang II front end under it and am currently working on mounting the rear end out of a '79 lincoln versailles in there. We are using the lincoln leaves at the moment. My question is, How do you know what angle to mount the shackle at. The body, engine and transmission are currrent off the truck so there is no weight on the springs. A couple of times we have welded the shackle mounts on, just to have the shackles roll over when you bounce it. Is there any tricks to getting it right the first time.
I think I understand your problem, best suggestion I have would be to get the measurements from shackle to leaf mount off the Lincoln...should take all the guess work out of it.
This isn't the busiest forum on the site so sometimes it takes a while to get an answer.
We're also doing a '41 but the springs & stuff came in a kit along with all the front-end chassis stuff. I'll print this out and ask Steve tonight if he can answer your question. I'd give you an answer, but I don't know which part is the shackle. If it's that part the springs hang on, then I could measure the length of ours and drop a couple photos in my gallery to show you how ours is set if it would help.
Might have to head to a wrecking yard with a tape and check things out.
Other thing is you may want to look at the '48-6? board, there's a rearend section that talks about widths...might post there too...don't limit yourself to just this forum