Spring Sag? - how much?

[rufusbooth]

To all of you that have bone stock blazers (I know, all 2 of you)...

Does anybody have the specs on how much space should be between the top of the u-bolt plate and the bottom of the bump stop? I am trying to figure out how much my Original 1973 GMC Jimmy springs have sagged both front and rear. Unfortunately, search turned up nothing... :-(

Cheers,

Rufus

 

[dyeager535]

It doesn't seem like the fronts sag as much as the rear. My truck isn't as old, but a 2" add a leaf in the rear made it almost dead even front/rear, FWIW.

 

[rjpastor]

Mine's bone stock and sits level. I have no idea on the distances but if you really need it I can go measure when it's light out.

 

[lectric80]

Mine is bone stock, and I have enough sag in the rear to start to unload the front springs. This gives the fronts a more normal upward arc, compared to the stock reverse arc that they should be at. The front springs tend to hold up better than the rear springs.

 

[ezoliver]

The front springs tend to hold up better than the rear springs.

That is until you do a few mild jumps with the stock front springs....
My passenger side was about touching the bump stop after some jump abuse (just before I pulled them off to put new lift springs on)

 

[rufusbooth]

According to my "calibrated" eyeball I have about 1.75 inches between the bracket and the bump stop. I will measure it tonight. I know that the springs should have a reverse arch to them but it seems a bit more than I remember.

I am sitting level currently but I am planing on doing a shackle flip in the back and either rebuilding the pack or replacing it but if they are sagging...replacement time.


Rufus