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Pinion Gear Nut

This is a discussion on Pinion Gear Nut within the Drivetrain forums, part of the LSx Technical Help Section category; Okay... replaced the rear pinion seal today. According to MFR, you're supposed to mark the pinion gear nut before disassembly, ...

  1. #1
    Senior Member Naaman's Avatar
    Join Date
    Mar 2010

    98 Z28 Vert M6

    Pinion Gear Nut

    Okay... replaced the rear pinion seal today. According to MFR, you're supposed to mark the pinion gear nut before disassembly, and then tighten it back down 1/16th past the mark. But there is no torque spec for the nut, so you don't really know whether it's tight enough, even if the marks are aligned (how do you know if you've over tightened it or if it's not yet tight enough, since the marks pass each other several times as you thread the nut on there?)

    Anyway, I did the best I could, but I think my rear end "howl" might have slightly increased with the "new" setting. Is there anyway to fix this without dropping the whole diff and taking it apart?

    I'm not afraid to crack it open... it's the removal/installation that I'm worried about.

    So, anyone done this before? Anyway to test it without driving it?

  2. #2
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006

    2000 WS6 6spd Hooker LT

    Well, that method works ok, you are supposed to tighten it until it stops, then the 1/16th past the mark. There should be no slop/play in the pinion input shaft when you do the final tighten. Is it loose now?

  3. #3
    Former Mopar Man 2002ssslp's Avatar
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    Jun 2011
    Branchville, NJ

    Silver & Blue
    02 Camaro SS, 04 GTO

    I do not know of any spec for a pinion nut but 1/16 after tight sounds right.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  4. #4
    Member Supershafts's Avatar
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    Apr 2010
    Long Island, N.Y.
    1971, 73,78, 85,92,95,

    You need to count the turns off and then back on and 1/16 more when you get to that number.

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