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Model number for 18 speed single overdrive trasmission

Discussion in 'Trucks [ Eighteen Wheelers ]' started by terrylamar, Mar 26, 2011.

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  1. Mar 26, 2011 #1
    terrylamar

    terrylamar Road Train Member

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    Does anyone know the model number for this transmission. Also, what is the final overdrive gear ratio and assuming I have properly geared rearends, say a 264 or 279 (whatever the numbers are) how fast can I go within reason?
     
    terrylamar, Mar 26, 2011
    terrylamar, Mar 26, 2011
    #1
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  3. Mar 26, 2011 #2
    SL3406

    SL3406 Medium Load Member

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    The single overdrives are the A ratio and the double overdrives are the B ratio. The final gear ratio is .86 in the A.
     
    Last edited: Mar 26, 2011
    SL3406, Mar 26, 2011
    SL3406, Mar 26, 2011
    #2
  4. Mar 26, 2011 #3
    112racing

    112racing Road Train Member

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    112racing, Mar 26, 2011
    112racing, Mar 26, 2011
    #3
  5. Mar 26, 2011 #4
    black_dog106

    black_dog106 Road Train Member

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    Last edited: Mar 26, 2011
    black_dog106, Mar 26, 2011
    black_dog106, Mar 26, 2011
    #4
  7. Mar 26, 2011 #5
    Prairie Boy

    Prairie Boy Road Train Member

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    And .73 in the B.
     
    Prairie Boy, Mar 26, 2011
    Prairie Boy, Mar 26, 2011
    #5
  8. Mar 26, 2011 #6
    Prairie Boy

    Prairie Boy Road Train Member

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    264 0r 279 rears ????????????????


    OK let's say you want 100 MPH.

    100 MPH X .73 Tranny X 264 Rears X 1100 X 24.5 = 470 Rev per Mile

    = 1510 RPMs.

    100 X .73 X 279 X 470 = 1595 RPM's.


    Now with .86 Final drive.

    100 x .86 x 264 x 470 = 1067088000 = 1778 RPM's


    100 x .86 x 279 x 470 = 1127718 / 60 = 1879.53 RPM's.
     
    Prairie Boy, Mar 26, 2011
    Prairie Boy, Mar 26, 2011
    #6
  9. Mar 26, 2011 #7
    black_dog106

    black_dog106 Road Train Member

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    I could never have those ratios with the work i do...
    I would have driveline on the ground in one day with those gears...
     
    black_dog106, Mar 26, 2011
    black_dog106, Mar 26, 2011
    #7
    t800kwopper Thanks this.
  10. Mar 26, 2011 #8
    terrylamar

    terrylamar Road Train Member

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    OK, I'm missing something. I have looked at a list of Eaton Fuller 18 speeds, both ratios and I cannot find a single overdrive listing. Every model list the final ratio as .73.

    Can you be more specific as to the model number?
     
    terrylamar, Mar 26, 2011
    terrylamar, Mar 26, 2011
    #8
  11. Mar 26, 2011 #9
    Prairie Boy

    Prairie Boy Road Train Member

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    I could never use rear ratios like that either. Maybe he meant 3.70's ????
     
    Prairie Boy, Mar 26, 2011
    Prairie Boy, Mar 26, 2011
    #9
  12. Mar 26, 2011 #10
    terrylamar

    terrylamar Road Train Member

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    Uhhhhh, I left one part of the equation out, thinking it was self evident, maybe not.

    I intend to drive the 18 speed, single overdrive in 17th gear/direct drive/1.0 ratio and use the overdrive only when I need to do better than 57 mph. I was wondering what speed that .86 would do in this circumstances, never more than 80.

    Sorry for the confusion.
     
    terrylamar, Mar 26, 2011
    terrylamar, Mar 26, 2011
    #10
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