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Fuller 9spd same size as 13 or 18spd?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by C15Mike, Jan 17, 2018.

  1. Jan 17, 2018 #1
    C15Mike

    C15Mike Light Load Member

    54
    27
    Sep 15, 2016
    0
    I have a RTO 16909ALL trans in my 379 Pete triaxle dump with a MBN C15 rated at 475 and 4.30 gears that has started to leak pretty bad. I'm not really happy with the rpm drop between gears either and want to install a different trans, preferably an 18spd for the added torque capacity once I turn the motor up and I shouldn't have to spin the motor to 1800 rpm to keep it from lugging down into the next gear and have my egts skyrocket. I run close to 80k when loaded and don't do a lot of off-road driving. My question is are they all the same length so it will be a direct bolt in or would I need to shorten the driveshaft? Any thing else I should consider? Any help would be greatly appreciated thanks
     
    C15Mike, Jan 17, 2018
    C15Mike, Jan 17, 2018
    #1
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  3. Jan 17, 2018 #2
    maggard359

    maggard359 Medium Load Member

    476
    412
    Nov 20, 2013
    Florida
    0
    Be same. I would go with a 18918 at least for torque and upgrade your clutch while you are at it. That 16909 will have a lower torque clutch behind it more than likely.
     
    maggard359, Jan 17, 2018
    maggard359, Jan 17, 2018
    #2
  4. Jan 19, 2018 #3
    04 LowMax

    04 LowMax Medium Load Member

    440
    248
    Feb 3, 2013
    Alberta
    0
    I have an 18 behind an MBN and the short rpm drops work super well. Just be aware that right now your lowest forward gear ratio is 23:1, which is a lot lower than the lowest on the 18 which is 14:1 (didn't bother with the decimals on these) . I don't know on the dimensions but I'm sure Maggard knows what he's talking about. He usually does. You have 2 gears lower than the 18's lowest. But then you're at 80,000 vs my 140,000 and I often have to lift that in soft yards in the spring, and have so far managed ok. But check the clutch too, like Maggard says.
     
    04 LowMax, Jan 19, 2018
    04 LowMax, Jan 19, 2018
    #3
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