Cross member swap what springs?

[Mikemelton]

I’m sure this has been asked but I’ve been searching for over an hour and can’t find the answer. I have a ‘65 1/2 ton putting ‘86 cross member in what springs do I use the one for the ‘65 or the ‘86? Thanks

[SkinnyG]

Doesn't matter.

I'd start with the springs you have, and see how it sits and rides.

If you're going to lower it, I'm a big fan of 1-Ton coil springs and cut them to the height you want. They are much stiffer (so you don't bottom out - kinda important) but still ride good.

[Mikemelton]

Well the truck is currently on an ‘86 frame and I am building a ‘65 frame to swap back under it and doing a 5.3/4l60 swap. I’m lowering it as I build it and trying to only do it once.

[AcampoDave]

I was once told by Early Classic tech support that squarebody springs have a greater spring rate than your stock ones. This was because they were heavier trucks with larger engines, A/C, P/S, P/B, all that smog crap, automatic trannys etc.