Lowering front end of Peterbilt

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wjhuskey, Aug 5, 2024.

  1. BoxCarKidd

    BoxCarKidd Road Train Member

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    So what answers are wishy washy to you?
     
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  3. SmallPackage

    SmallPackage Road Train Member

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    Take the taller blocks out from between the springs and axle. You will still need a spacer block at least the thickness of the center bolt head on the spring pack. Get new and shorter u-bolts bent for it. Hope you can shorten/adjust the drag link because thats gonna need to be messed with to get steering wheel and box centered again. And as everyone else has said realignment is needed. You should have the height you are looking for. Just be prepared for the aluminum fenders to start to crack in the arch just above the tires with this new look.
     
    BoxCarKidd Thanks this.
  4. wjhuskey

    wjhuskey Bobtail Member

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    SmallPackage, thanks for the info. I've seen countless early model 379's (especially show trucks) that set more like the later 379's so I knew there was surely a norm for doing it.
     
    260REM Thanks this.
  5. mile marker 27

    mile marker 27 Road Train Member

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    Maybe they had front airbag suspension.
     
  6. wjhuskey

    wjhuskey Bobtail Member

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    I had a 1992 Peterbilt 379 and added front air bag suspension. It never set that low in the front no matter the air setting because it still had the spacer blocks.

    Not to mention it didn't even really help the ride of the ol log wagon that it was.
     
  7. 260REM

    260REM Bobtail Member

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    I have a 1990 379 EXHD. It is a work in progress but I just got new tires and a alignment. I put 24.5 talls on front (original size) and 24.5 lo pro on rear while also putting a m834 (1.575 thick) spacer block instead of the original that was around 3.500" on front axle. Angle may have changed 1 degree. With the 330 wheel base it now has an ever so slight rake. goes down the road fine. However I haven't put it under a trailer yet.
     
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