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nv4500 vs 400turbo with gearvenders od!

Discussion in 'Engine & Performance' started by hungry joe, Jan 6, 2019.

  1. hungry joe

    hungry joe Junior Member

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    Joined:
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    Location:
    marcellus mi
    First Name:
    dennis
    Truck Year:
    79
    Truck Model:
    c30
    Engine Size:
    454
    ok, would anybody know what gas mileage would be with 410grs, nv4500,or 400turbo with GVenders od,witch turns 410s into 320s.i have a 79 1ton 2wd,and a 84 3/4 ton drive train,454engine semi floater rear same 410grs, might put the 79 body on the 84 chassie. big advantage with the 400th,is I don't have to shift it! and the OD of coarse!
     
  2. Jrgunn5150

    Jrgunn5150 Questionable methods

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    Location:
    Ionia Mi
    First Name:
    J.R.
    Truck Year:
    1979
    Truck Model:
    C10
    Engine Size:
    6.slow
    The GV OD ratio is .78:1, without a locking converter of course. A NV4500, Chevy, is .73:1, with full clutch lockup.

    A 4L80E is .75:, with a locking clutch, and you don't have to shift it.
     
    Big Chip likes this.
  3. hungry joe

    hungry joe Junior Member

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    dennis
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    79
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    c30
    Engine Size:
    454
    thanks jr,good to know! will starting this building may!
     
    Jrgunn5150 likes this.
  4. SquareRoot

    SquareRoot Full Access Member

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    Location:
    Arizona
    First Name:
    Mike
    Truck Year:
    85
    Truck Model:
    K20
    Engine Size:
    350
    To your question- gas milage will still suck no matter which one you choose. Your pushing a 6 ton brick down the road. The small difference in milage between the three won't be discernable.

    If that's an issue consider a Prius or the new Chevy Bolt.
     
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  5. Madhorn

    Madhorn Full Access Member

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    Location:
    AR-Arkansas
    First Name:
    Ken
    Truck Year:
    1977
    Truck Model:
    K10
    Engine Size:
    5.3/NV4500/NP205/4:56 gear/35in tires
    For what it is worth. I am running a 2003 5.3 in my 77 K10 with a NV4500, 4.56 gear and 35in tires. My last mph check was 15.6.
     
    Catbox likes this.
  6. eskimomann209

    eskimomann209 Member

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    Location:
    Modesto
    First Name:
    Marcus
    Truck Year:
    1973
    Truck Model:
    C10
    Engine Size:
    5.3
    That is a junk setup man....
    Wanna sell me your nv4500?
     
  7. Madhorn

    Madhorn Full Access Member

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    Location:
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    First Name:
    Ken
    Truck Year:
    1977
    Truck Model:
    K10
    Engine Size:
    5.3/NV4500/NP205/4:56 gear/35in tires
    Thanks. But I am good. It has been a great project and really is fun to drive. Pic from last summer.

    CC85A2BE-C819-42B8-8448-132437F0C57B.jpeg
     
  8. hungry joe

    hungry joe Junior Member

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    First Name:
    dennis
    Truck Year:
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    Truck Model:
    c30
    Engine Size:
    454
    hey ken, that's not bad at all! by the way,that pile of dirt on the floor looks just like my garage!:)
     
  9. Madhorn

    Madhorn Full Access Member

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    First Name:
    Ken
    Truck Year:
    1977
    Truck Model:
    K10
    Engine Size:
    5.3/NV4500/NP205/4:56 gear/35in tires
    Oh man !!!! You weren’t supposed to see that.
     
  10. DoubleDingo

    DoubleDingo Unconventional Thinker

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    Location:
    Red portion of the country
    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special, 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350, 1972 L48 350
    My '65 Crusty Biscuit, just as much of an air-pusher as these trucks, has 4.57 rear end gears and a 30% OD that drops those 4.57's to 3.19's. It has a stock 350 with a torquey cam, that's it. It gets 12-13 out of OD, 14-15 in OD. It likes about 2,600 rpms, that's the sweet spot and is keeping up with everyone around us. You're not going to get great mileage, but it can be improved upon to a point. My old '65, Mean Green had a stock crate engine, SM420 and 3.54 gears and got 16 cruising 70 mph. 3.54's sucked for climbing steep grades but that truck hauled ass!
     

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