Pete 379 rear ride height to offset car hauler w/ blocks removed?

Thats one nice rig!

 

You should set the ride height so that its close to center of the suspensions travel and so the frame is level. Then bust out your trusty dusty angle finder and adjust the shims on the rear ends, carrier bearings and engine mounts so that the angle of the dangle is correct.

 

I'd find a good driveline shop or alignment shop. With the front end so low you might not be able to get the angles correct with rode height alone. Or at least not a setting that isn't to close to the stops

 

Those factory settings are for basically trucks that are brand new with no wear and stock wheels and parts. Once things wear out, you have to use a drive line analyzer and go from there. I have one which cost like 300 bucks. Anyhow, your air trac wear pads are also wore out unless someone replaced them. Those change pinion geometry significantly.
Anyhow, to get you going, just measure from the centerline of your rear axle to the bottom of the frame. If you have it set at factory specs, you are probably seeing around 11”. And of course that is waaaayyy to high for you and causing all that noise up through shifter. Knock that setting down to about 10 1/4” and take truck for a ride. Noise should be totally gone.
You might even have to bring it even lower. If you don’t hav anymore adjustment, you gonna have to cut down the stationary rod a little. Or even better yet, make an adjustable one which people have done

 

What suspension and how are you taking your measurements?

 

8.5" is the loaded height, 8 3/4" unladen. You said engine was replaced, was engine put back @ original angle? Pete used washers as shims on rubber mounts to set engine @ 2°or 2.5°, which ever build calls for. Also, driveshaft was out, is it in original phase?

 

sorry guys. i dont know why in my mind i thought air trac.