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Cummins conversion question...

Discussion in 'The Garage' started by DieselBurb, Jan 13, 2004.

  1. DieselBurb

    DieselBurb 1/2 ton status

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    If I can find one in my price range, I am wanting to convert my 6.2 /forums/images/graemlins/burb.gif to 5.9 CTD. My question is: does the CTD have the RPM for my TH400/4.10/33 setup? I want to be able to cruise at highway speeds (normal speeds that is /forums/images/graemlins/wink.gif)
     
  2. azblazor

    azblazor 1/2 ton status Premium Member

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  3. Stomper

    Stomper ΜΟΛΩΝ ΛΑΒΕ GMOTM Winner

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    65 mph = 2713rpm
     
  4. Diesel Dan

    Diesel Dan 1/2 ton status

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    Depends on what year you get.
    The '89-93 with VE rotary pumps are governed to 2500rpm.
    IMO a TH400,4.10s and 33s would be pushing it for highway driving.
    I had a 1990 dodge for a while. It had a 727(3sp), 3.07s and 30.5s. I wouldn't want to push running 4.10s without OD.

    As far as the RPM charts go, do they include an extra 200 rpm for converter slipage? They will have more/less depending on what load is being pulled. Even the converter in my old '88 crewcab showed a noticeable rpm difference from empty to loaded at ~2500rpm.
     
  5. one ton burb

    one ton burb 1/2 ton status

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    Can you just bolt a th400 up to a cummins or do you need a special mounting plate made up for it
     
  6. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Dodge cummins motors have a different bellhousing pattern than GM but GM cummins are known to exist in commercial vans.
     
  7. Stomper

    Stomper ΜΟΛΩΝ ΛΑΒΕ GMOTM Winner

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    There is a cummins/gm adapter from a p30 van. You would need the adapter, flywheel, torque converter spacer and starter. Along with some other odds and ends.
     
  8. Stomper

    Stomper ΜΟΛΩΝ ΛΑΒΕ GMOTM Winner

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    I wasn't trying to imply that the engine would or could turn those RPM's but those numbers are close to what the combo would generate.
     
  9. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    I'd look at OD like a Gear vendors or at least go to a 35 inch tire to Get the RPM's down a little.
     
  10. K5 NUTT

    K5 NUTT 1/2 ton status

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    Mosesburb is currently installing a 5.9L cummins in a 72 Burb...my old burby. He will be using a NV4500 with a NP205 and a doubler i believe...pm him about the adapters.

    The p vans did run the 4 cyl version of the cummins...

    DW
     
  11. muddin4fun

    muddin4fun 3/4 ton status

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    [ QUOTE ]
    65 mph = 2713rpm

    [/ QUOTE ]

    I've got a '93 dodge cummins

    Redline is at 3000rpm
     
  12. Drey

    Drey 3/4 ton status

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    Im lookin to throw a older 12Valve Cummins in my GMC sometime down the road(3-4 years), would a 700R4 work with that P30 stuff? It will be a built 700R4 and would be able to handle the power...till i get to crazy.
     
  13. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    Im lookin to throw a older 12Valve Cummins in my GMC sometime down the road(3-4 years), would a 700R4 work with that P30 stuff? It will be a built 700R4 and would be able to handle the power...till i get to crazy.

    [/ QUOTE ]
    I am probably the member that is most loyal to Th700's but even I would have to rethink using a 700 behind a cummins. /forums/images/graemlins/shocked.gif /forums/images/graemlins/shocked.gif
     
  14. afroman006

    afroman006 1/2 ton status

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    I second the doubt about a 700 behind a Cummins. My friend smoked the Getrag in his 90 cummins 4x4 so I dont think a 700 would even get you out of the garage. If you want to keep the 33's I'd get like 3.73 or even like 3.42 gears because that engine has more than enough power for that combo. Good luck with the swap.

    PS...do a writeup /forums/images/graemlins/thumb.gif
     

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