I have a 1500 (2000, 5.2, nv3500, 2wd) at 150k thats experiencing some sag on the driver's side, problem being it has a Fabtech lift thats long been out of production. I believe its a 6" and looks to have spindels, uppers and coils. I suspect the front coil spring is the culprit, but I have not been able to find any form of a replacement spring that would work. Just looking for some ideas for locating a replacement or a fix so I can get the truck back to level. Any help is appreciated greatly.

Im also thinking of replacing the rear leafs as that could also be the source of the issue, as well as replacing the helper bags the previous owner installed as they're blown out.

 

Call fabtech, see what they suggest. If nothing else, get the dimensions of the springs, and see if you can find anything in the aftermarket.....

 

How far off are we talking? I would check the rear leafs first to see if any are cracked, they can be hard to see sometimes (behind the U-bolts for instance, or covered under grime). I've had 2 cracked leafs in past, one factory leaf and one aftermarket add-a-leaf that noticeably threw off the front and rear, so would not surprise me one bit if that is part of your problem. Still have about 3/4" sag on DS like you after fixing the rear with 5" RC lift. It might be the coils settling after many years, worn coil isolators, more weight due to fuel tank on DS....not sure. That said I don't think to be off 1/2"-3/4" is that bad, hardly noticeable with large wheel gaps, merely parking on different surfaces seems to change measurements by 1/4" here or there.

 

I shot them an email, they said that they dont even have the specs for the parts in the system since its been so long.

 

I went out and measured and I believe you're onto something with the leafs, Its sitting about a 1 1/4" lower on the driver's rear, its not terrible but enough to where I noticed it just looking at it. I'll probably put it up on the lift at work and give the springs a once over on friday.