Differential models

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Leftlanemilktrain, Aug 4, 2020.

  1. Leftlanemilktrain

    Leftlanemilktrain Bobtail Member

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    What is the difference between a dhs40 and a dsp40 diff?
     
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  3. Bean Jr.

    Bean Jr. Road Train Member

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    P stands for pump. Apparently not necessary, as i switched mine from DSP402 to DS402
     
  4. Goodysnap

    Goodysnap Road Train Member

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    The P in DSP stands for planetary double reduction.

    I believe its DSH and the H is for High performance or high horsepower applications.

    Google "Dana Service manual" and it calls out all the meanings for the model numbers.
     
  5. Bean Jr.

    Bean Jr. Road Train Member

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    I'm not sure that a DSP40 is "double planetary", but I do know that I was talking about a completely different rear-end than the op was asking about. DS402p is an Eaton, and the p stands for pump in that one.

    To quote Rosanna Rosanna Danna, "nevermind!"
     
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  6. dirthaller

    dirthaller Medium Load Member

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    DSH has a 3/4” larger diameter ring gear. It’s an oddball.
     
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  7. Leftlanemilktrain

    Leftlanemilktrain Bobtail Member

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    Would either these be considered a super 40?
     
  8. dirthaller

    dirthaller Medium Load Member

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    I would not consider a dsp40 a “super 40” however, back in the day, a ds405 was considered a super 40 because they had heavier axle housings....even though they had the same basic differential as a ds380, ds402, ds404 and dsp40. Are you confused now?
    The only reason to spec a dsh40 is to satisfy hp/torque requirements for the truck manufacturer if you insist on 600/2050 in a standard road truck application.
     
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  9. dirthaller

    dirthaller Medium Load Member

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  10. Bean Jr.

    Bean Jr. Road Train Member

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    DS405 is an Eaton. DSP40 and DSH40 are Dana.
     
  11. dirthaller

    dirthaller Medium Load Member

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    I’ve installed ds404 in dsp40 housings as a direct swap
     
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