Peterbilt 379 rear ride height to offset car hauler axle with blocks removed?

I’ve got a 2007 Peterbilt 379 factory 290” wb with the car hauler front end and the blocks removed and low air suspension on low pro 24.5’s. It has been like this since I bought it. Put new motor and tranny in plus a new leveling valve. I’m trying to set the ride height but not having any luck. I’ve set it at factory recommend setting and it shifts great but I have a rattle in the shifter accelerating and a growl going down hill with it gear at highway speeds. Does anyone have a correct setting for ride height to offset the new angles because I can’t find a good setting that doesn’t growl one way or another?