Spring to air ride suspension conversion - pete379

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hopeaholic, Nov 7, 2018.

  1. Hopeaholic

    Hopeaholic Bobtail Member

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    hey gang. I'm looking to replace my rough riding Hendrickson rear spring suspension on my 1991 Peterbilt 379 with a low air leaf setup from a frame cutoff that came from a 2003 Peterbilt. My plan is to remove all the old spring components, keep the existing frame and rear tandems, drill appropriate mounting holes and transfer the low air leaf parts. Any words of wisdom on whether this is a good plan would be much appreciated!! Thanks in advance.
     
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  3. Rideandrepair

    Rideandrepair Road Train Member

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    I guess you want to do all the labor otherwise why use the new cut off and stretc it out while you’re at it. I’ve seen it done at the right spot around front spring hangers works good.
     
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  4. Rideandrepair

    Rideandrepair Road Train Member

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  5. Hopeaholic

    Hopeaholic Bobtail Member

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    Yes hoping to do myself and wouldn't be too excited about splicing the frame.
     
    Rideandrepair Thanks this.
  6. lester

    lester Midwest's #1 Feed Hauler

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    Be a lot of empty holes and alot of new holes. I'd say depending on the condition of your current frame I'd just cut your old one off and weld in the new one. Think that would be easier. Decent job either way
     
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  7. 201

    201 Road Train Member

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    I did that, or had that done, to my '82 Western Star. conv. It originally had that White "Reyco", and after a month of breaking springs in Chicago, I said, "that's it". I had a rear stub from a 362 spliced into the WS frame. It made a world of difference. Sounds like a lot of hassle what you want to do. I agree, cut the back off behind the cab, get 2 inner rails for inside your ( and the stubs) frame, maybe stretch it a bit, perfect time to for a better ride, bolt and weld, it will be almost like a double frame. I never had a problem with that setup and I hauled a lot of heavy rail cans.
     
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  8. Bakerman

    Bakerman Road Train Member

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    It’s going to be less labor and much easier to cut off the Hendrickson and splice in the low air leaf.
     
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  9. Hopeaholic

    Hopeaholic Bobtail Member

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    Should have mentioned the donor tandem differentials are gutted and I'm not a welder. Might that change the calculus on level of effort and labor cost?

    Thanks for all the responses so far.
     
  10. 201

    201 Road Train Member

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    Yeah, that could change it somewhat. Not a simple swap, pulling carriers and such. Just so you know, it's a female dog drilling holes in frame rails. Best thing is to rent one of those hole shooters that clamp the frame and about 20, 3/4 inch drill bits.:mad:
     
  11. Rideandrepair

    Rideandrepair Road Train Member

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    I had some holes drilled once for mud flap hangers. The guy drilled smaller holes first then used a reamer bit that really worked good
     
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