Coilovers - Replace both spring and shock or just shock?

I've got a 2004 TRD Xtracab with the original coilovers and rear shocks. She rides really rough on the dirt roads out here. I'm thinking the shocks all around need to be replaced but I'm not certain about replacing the springs up front. It looks like new coilovers for up front are pretty expensive so I'm trying to save money if possible. Any way to assess the springs up front or assume they're not so great after 20 years? I'm planning to go with standard 4600 Bilsteins all around.

 

Mines an '03 and recently did a front end refresh. Disclaimer: after 20 years rubber deteriorates and it's probably a good time to consider lower control arm bushings, steering rack bushings, ball joints and maybe TRE's. A lot of different things can cause rough riding or poor steering performance. I went with new A-arms (so I didn't have to deal with pressing bushings,) TRE's, ball joints, ES red rack bushings, OEM rack and the shock solution described below. I'm so glad I did, drives like new.

On the coilovers, two options:

1. Rent/buy a spring compressor, re-use the springs. You'll need new top hats and associated top of coil hardware, the lower bushings come with the Bilsteins (at least mine did.)

2. If you're not confident operating a spring compressor (it can be unnerving and dangerous) just replace the coilovers as an assembled set, which is what I did. You won't have to deal with finding the right fitting hardware or wind up seeing you forgot something when you get it apart. This set is what I'm running. It is the best deal you'll find on an assembled 4-corner package and is the closest to stock you'll get, Moog springs. These guys are based in Canada but operate from a Torrance, CA address and ship from warehouses all over the country, mine came from two addresses in a matter of days instead of a week or two.

 

Shocks themselves should've been replaced at 50-60k miles.

Long overdue.

Being on factory coils, just replace them.

Your truck is supported (up front) by coils and (in the rear) your leaf pack.

Using such worn components means your new shocks will wear down prematurely as your coils and leaf pack aren't up to the task of maintaining the truck's weight as it used to.

Shocks only have one job and that's for dampening.

You've been here for a long time, don't neglect your truck.