Some time ago I asked about the Z measurement as it relates to torsion bar adjustment. So, I found a reference to it in the Haynes manual. Its different for the 1500 and the 2500 (so where does my 1500HD fit in?) Anywho its the distance from the centerline of the lower control arm pivot bolt to a level line (imaginary) from the bottom of the steering knuckle(not the ball joint).

1500 = 3 5/16 to 3 45/64 inches
2500 = 4 5/16 to 4 45/64 inches

Ya, like i'm gonna measure to a 64th of an inch :eek:

No other mention of why or what it does for you or not for you

I remember looking for the z measurement on my 94 K1500 blazer. I finally measured from the lower a-arm pivot shaft (center) to the ground. Tire pressure had better be the same, or your measurements may not reflect the actual height.

I'm thinking that you would want to get the distance close with the z measurement, and if you wanted to go to 11, weigh the corners and adjust accordingly.

And I assume that the truck must be on level ground, w/ tires the same height, perhaps measure from the rim to the floor and adjust air as needed. Plus the snubbers would have to be new or at least not crushed(like mine) :rolleyes:

I have read on gm-trucks.com that this Z-adjustment is reported to improve the ride quality after cranking the T-bars higher. Don't know if this is true or not, but some have stated that is the case.

I don't know either, except that t-bar adjustment is how you get the right Z, I think. So if you crank'em up your Z will EXCEED the max rating. I don't see how you could crank up the bars and still maintain the right Z..

Yep, cranking them up to factory specs definetly improved the ride on mine.

1500hd is same as 2500