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    Results 1 to 7 of 7
    1. #1
      Join Date
      Aug 2009
      Location
      Chandler, Az (from west NE)
      Posts
      240
      Country Flag: United States

      TrueTrac shudders on turns from a stop

      The TrueTrac diff in my 2002 S10 has developed a shudder on left or right turns from a stop. Feels like driving with a spool on street tires. Not too noticeable above 25 or so, but it does want to slide a lot easier then too. I did remove my summer UHP tires for some all season rollers while the weather is colder. Fluid, Valvoline 75w90 gl5 reg , is full and clean. It's about a year old with 5 autoX events and 4K hard street miles on it. Any idea?
      Ric

      2002 s10, DD and AutoX.
      1966 Malibu owned since 1971. Drag car converting to track toy!

    2. #2
      Join Date
      Jan 2020
      Posts
      19
      Are you running the additive?

    3. #3
      Join Date
      Dec 2016
      Posts
      35
      Quote Originally Posted by Whiteghost66 View Post
      Are you running the additive?
      If you are, you shouldn't be running it. TrueTracs aren't a clutch type posi and don't want the extra friction.

      https://www.eaton.com/us/en-us/produ...trac-faqs.html

    4. #4
      Join Date
      Jan 2020
      Posts
      19
      I know the Ford 9 trak-lok posi units need friction modifier to eliminate clutch chatter when cornering. Each brand has their own specific guidelines.

    5. #5
      Join Date
      Dec 2018
      Posts
      25
      I've currently got a trutrac in the 9" on my Fairlane, and my old tow rig/dd f250 had a trutrac in it's 10.5" rear. Both developed a shudder when turning at an intersection until I added a little friction modifier even though Detroit says not to. Both were running the recommended non synthetic gear oil too.

    6. #6
      Join Date
      Sep 2010
      Location
      corona,ca.
      Posts
      1,078
      Country Flag: United States
      Quote Originally Posted by Whiteghost66 View Post
      I know the Ford 9 trak-lok posi units need friction modifier to eliminate clutch chatter when cornering. Each brand has their own specific guidelines.
      Read what ryan said NO CLUTCHES
      Tru trac has helical gears,no clutches,so you use standard gear oil.
      72 chevelle.

    7. #7
      Join Date
      Oct 2004
      Posts
      2,544
      Country Flag: United States
      It looks like what you've been using is synthetic. According to Eaton, you're not supposed to use friction modifiers or synthetic oils in their TrueTrac. I'm running non-synthetic in my truck's 8.6" for about 80k miles with no issues.

      Red Forman: "The Mustang's front end is problematic; get yourself a Firebird."






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