Spring swap
 

So the K20 I just inherited has the F60 and G50 heavy duty spring options. I need to soften up the ride. The choices for new springs appear to be 1110 lbs , 2350 lbs , 3390 lbs and 4100 lbs. The truck has a steel flatbed on it so I'm guessing the 1110 lbs springs would be too light. The truck is only gonna do light hauling from now a scoop of dirt or gravel etc. Probably won't tow more than a 1 ton capacity trailer. How about some ideas on what spring rates to consider ?

Re: Spring swap
 

I would think the lightest springs would still hold the truck at ride height. Not clear on your need. My stock K10 shortbed with the lightest springs rode like a buckboard wagon. Reason I had the longer custom springs made for my wants. Was quite a bit of work to fit them. My 72 K20 longbed had stock leafs in the back and it was not good unloaded. Maybe a consideration is the light springs with air assist bags to adjust for load?

Re: Spring swap
 

What year is your truck?

I only looked at info for 1967 because that is what I have.

Standard Front is 1600 and rear is 1900 lbs.
HD Front is 1750 and rear is 2500 lbs.

edit: Looked at your post history, you have 1971 and the spring rates were the same according to the dealer info books... download yours here - https://www.gm.com/heritage/archive/...formation-kits

Re: Spring swap
 

If you go to the manufacturers site, you might be able to see the Spring Rate, which tells you how many lbs compress the spring 1".
Comparing rates might help a bit determining a softer/harder ride, at least for linear springs

Re: Spring swap
 

OK Thanks, I'll do some more digging