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Thread: Front pinion seal

  1. #1
    Join Date
    Jul 2014
    Location
    Central Pa.
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    133

    Default Front pinion seal

    I replaced a leaky front pinion seal. I went to the dealer and picked up new seal and crush sleeve. My question is...How tight do I tighten the pinion nut with a New crush sleeve?

  2. #2
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Front pinion seal

    Since you removed the nut before taking measurements, torque it until it reads 15NM or 2 inch pounds rotational resistance with wheels removed
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
    Join Date
    Jul 2014
    Location
    Central Pa.
    Posts
    133

    Default Re: Front pinion seal

    I've seen where some people have gone as high as 600 ft lbs?? And looks like I need an inch lb torque wrench. I went to 200-210 and still sloppy.

  4. #4
    Join Date
    Oct 2010
    Location
    Conroe Tx
    Posts
    532

    Default Re: Front pinion seal

    Torqued my Dana 30 to 180 and put loctite, so far so good after 5000 miles

  5. #5
    Join Date
    Oct 2010
    Location
    Conroe Tx
    Posts
    532

    Default Re: Front pinion seal

    I Read 3-400 with new crush sleeve but i don't know how accurate that is

  6. #6
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
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    Default Re: Front pinion seal

    Yes it takes some torque. Buuuuttttt, it is the rotational resistance that counts, not the torque on the nut
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  7. #7
    Join Date
    Jul 2014
    Location
    Central Pa.
    Posts
    133

    Default Re: Front pinion seal

    So tighten in increments until I can get that reading with an inch lb torque wrench. And front wheels removed.

  8. #8
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Front pinion seal

    Yes, that will give you the preload you need on the wheels
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  9. #9
    Join Date
    Jul 2014
    Location
    Central Pa.
    Posts
    133

    Default Re: Front pinion seal

    Thank you Steve, now it rolls without the noise in 4wd. I thought I was to tighten pinion nut to 200 ft lbs. But with new crush sleeve and seal it needs to be much higher to get the sleeve to crush properly.

  10. #10
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Front pinion seal

    Glad it worked out
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  11. #11
    Join Date
    Jul 2014
    Location
    Central Pa.
    Posts
    133

    Default Re: Front pinion seal

    So how hot should that front differential get?

  12. #12
    Join Date
    Jul 2014
    Location
    Central Pa.
    Posts
    133

    Default Re: Front pinion seal

    Just a concern.. I worry too much.

  13. #13
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Front pinion seal

    Diffs get pretty warm. 200 degrees is not uncommon, as with a tcase too
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

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