I've installed dozens in customer's trucks. Mostly Furds.
They will lower the rear of the truck 1/2" to 1" because they are a little longer. The rear will also feel a little wiggly with loads in the bed.
Yes they work. The expansion cracks on a concrete freeway will dissapear.
You can get them at NAPA too.
The fit on your older truck should not be a Problem if you have leaf spring in the rear.
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