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

Discussion in 'Peterbilt Forum' started by adamgrahamtransport, Aug 5, 2021.

  1. adamgrahamtransport

    adamgrahamtransport Bobtail Member

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    Aug 5, 2021
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    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?
     

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  3. Nss

    Nss Light Load Member

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    Jul 5, 2021
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    Dump air to bags while driving for short period of time, assuming you have you have dump switch in dash. If it gets better you know it has to be adjusted lower. If worse go higher
     
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