'99 379 rear airbag height.

@Hollywood2317 Reading that, it says the center section is 1 1/2in lower than the regular axle. Check it out.

 

So if i read that right, a normal axle only drops 3 1/2"

 

That's what I got from it, yes sir. I apologize because I know you mentioned the front axle very early on. I'm with you now in believing that's your difference/problem. What I'd like to know is, many guys make the change to that front axle, so how do they compensate at the rear?

 

Have no clue myself.

 

If you don't mind, let us, or me, know what you find. Our trucks being similar, I may get something valuable from it.

 

I will do, gonna check it out tomorrow. Thanks for everyone's input and suggestions.

 

i have fought similar issue with 2000 model air trac on a 379.

Finally got it close to level which greatly improved the ride and vibrations.

I have 4.5 axle spacer, new springs, 11r 2r.5s, and taller shackles for a sba truck to get front up as much as possible. This got it to a tolerable amount of rake to the front with new 11r24.5 drives.

Then I swapped drives with my other truck so I have low pro 24.5s and put 3 tires with a bit more wear on front drive axle. This got me to almost perfect level at all 4 corners of the drives.

 

The Ft. springs are sold with different arch size , i think 2 or 3 diff. arch are sold at parts store, if they put car hauler ft. springs on ft with lowest arch plus the low blocks that will make a big diff. in ft end ride hi. and will make back air bags look like what you show in pictures?

 

Measured from bottom of frame to top of springs and it sets 9 1/4". Also measured from shocks. Measuring middle of bolt and its 16 1/4" which both are about a 1/4" taller than my buddies truck. So still stuck wondering....

 

Did you measure that center section to see which axle it is?