I have a 90 pickup ext cab with the 3.0 v6. I am doin a SAS here pretty soon and wanted to know if I should go with the HD springs since it is a 3.0 v6 If I don't want the springs to settle too much and lose ride height? Or do the regular springs hold up pretty well with the 3.0 since it is not that heavy for a v6?

 

I would run the HD springs, they will settle but it'll take a little longer. I'm running reguler springs on the front of my crawler and they are already settled after about 7 or 8 runs now my 87 4runner with a 3.4 sits stink bug.

 

if you use 4inch allpro springs than you don't have to worry about hd springs the allpros support the weight of the 3.0 or 4.3v6 rather well and they break in rather quick

 

If you run the "trailcrap" springs you might better go with HD and a replacement plan. My buddy has an old set of 4" allpro that have been run for years that are now supporting a 3.0, he stripped his old '81 to build an '88 4rnr. He even bent a spring running no bump stops years ago, you can notice it in one of the pics. I've watch him beat on them.
https://www.yotatech.com/forums/f37/...feeler-232693/

I'm running 4" but have a 22RE. You could always go up to 5" springs if your that worried.

 

There is no need for HD leaf springs except for V8 engine weight or extreme loadings.
Most leaf springs fail due to improper bumpstops or none at all.

:wabbit2:

 

I've been running Marlin 4" springs for years without issues....

 

i have to disagree there wabbit. just because i have 4 in. tg springs and a perfect shackle angle and they were a little soft. i hammered the bumps all the time. i added a leaf and some more progressive bumps and its fine now. the springs were just a tad soft for my aplication and adding the leaf helped more than i can say. by the way hows the taco project coming