pinion nut size?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Juicehauler, Jan 6, 2014.

  1. Juicehauler

    Juicehauler Light Load Member

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    Dec 17, 2013
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    kind of a long shot, does anyone know what size socket is needed for the pinion nut on an rt40-145 rear rear end? i know i don't have a socket big enough so i am tryin to find out before i start taking it apart.
     
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  3. Semi Crazy

    Semi Crazy Road Train Member

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    Middle Tennessee
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    If ya asked about a DS/RS 404 I could've told ya. Anyway when you find out, Northern Tool was having discounts on their big mamajamma impact sockets. Around $20 each for differnt sizes over 2" with 3/4 and 1" drive.
     
  4. Juicehauler

    Juicehauler Light Load Member

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    Dec 17, 2013
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    Well that might be a start lol, what size is it? I could simply measure it but I'm 500 miles from the truck and would like to have the tools sittin there for when I get home.
     
  5. GrapeApe

    GrapeApe Road Train Member

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    I don't know the socket size for sure, I tried the manual, but no socket size listed. The front is a different size than the rear, so if you're doing both, you'll need 2 sockets. Our pinion nut set that has worked on all the seals I've done so far has: 2", 2-1/8", 2-1/4", 2-3/8", 2-1/2", 2-5/8", 2-3/4". Not a huge help, but narrow's it down a bit.

    If it helps any, here's the thread sizes and torques:

    Front carrier input - 45mm 1.5 pitch, 600-800 ft/lbs.
    Front carrer output - 39mm 1.5 pitch, 450-650 ft/lbs.
    Rear carrier input - 39mm 1.5 pitch, 920-1130 ft/lbs.
     
  6. Juicehauler

    Juicehauler Light Load Member

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    Dec 17, 2013
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    got er figured out, 2-1/8" was the size, pulled the seal to replace it and i was gonna pull the outer pinion bearing to check the condition, but it won't slide off the pinion, is the outer bearing a press fit? i know the inner is pressed for sure but thought the outer should come off easy.
     
  7. bulldogfan

    bulldogfan Bobtail Member

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    Apr 18, 2010
    boston, ga.
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    I know this is an old thread but......I need to "time" my driveshaft's and obviously remove the nut on one of the carrier yokes. So my question is how the heck are you torqueing 800 ft/lbs? That's a big wrench that I don't have! any ideas?
     
  8. Duckman1005

    Duckman1005 Bobtail Member

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    Nov 18, 2015
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    A big ### impact wrench! lol
     
  9. AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    Not sure what you mean by "time"

    The driveshafts are assembled in proper phase then installed in the truck. The only way to get them out of phase is if the driveshaft is twisted or someone had it apart and re-assembled the slip yoke out of phase. As for the nut, I usually just rattle it up with a 3/4" impact and I've not had a problem yet. Obviously you wouldn't wan't to beat on it all day long but a couple seconds after the nut stops turning should be good. Make sure to use a new locknut as well.
     
    joey8686 Thanks this.
  10. sdaniel

    sdaniel Road Train Member

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    200 lbs of pull on a 4 foot breaker is 800 foot pounds . Can get a feel that way.
     
  11. bulldogfan

    bulldogfan Bobtail Member

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    Apr 18, 2010
    boston, ga.
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    I purchased the truck used and while looking for cause of driveline vibration I noticed all the yokes are out of time.
    Have read that it makes a difference.
     
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