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I think racers back in the day would notch their stock trailing arms. The Owens Corning Team comes to mind immediately, or maybe it was shown in the Chevy Power book.
edit: yes there is a picture shown in the old Chevy Power book and short discussion of the modification.
Keep inn mind that the larger the Diameter of the Wheel the less the need for offset arms. Depending on what Wheel and Tire You intend to run You might not need the offset.
Test-fit the new wider tire/rim on the car first to see what you actually need to do. Definitely make a jig to keep the pivot point/spindle distance accurate.
(A previous owner used a press to off-set the trailing arms on my project.......I was completely unable to adjust the toe until I re-worked the offset arms )
This is something I've put some thought in on too. Seems like you need to make a jig to mount the arm to. Then cut the arm and weld in the offset.
But like gale banks suggested? I'll be going to larger wheels instead.
Would it not be better to first weld in the offset, then cut out the original section where the tyre would rub? This way, the attachment points of the arm would not move relative to each other.
I am running 18" wheels and have stock trailing arms.
Me too. I did relocate the e-brake cable but I might not have needed to. Rear wheels are 18' x 9.5" with 5" back space. Tires are 275 wide. Every thing clears, stock ride height.