Trans-X® Posi Trac® Limited Slip Gear Oil Additive, 7 oz.
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K & W Chemical Trans-X® Posi Trac® Limited Slip Gear Oil Additive, 7 oz.

Part No. 402508 Warranty  
Designed to quiet chattering differentials and improve gear oil performance. Use with conventional GL-5 or synthetic gear oils.
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Concentrated:No
Container Type:Tube
Size :7 oz
Spray:No
Type:Limited Slip

REVIEW SNAPSHOT®

by PowerReviews
K & W ChemicalTRANS-X Posi-Trac Limited Slip Gear Oil Additive
 
4.3

(based on 11 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

91%

of respondents would recommend this to a friend.

Pros

  • Easy to use (9)
  • Reliable (3)

Cons

    Best Uses

    • Home garage (7)
    • Automotive repair shop (4)
    • Upkeep (4)
      • Reviewer Profile:
      • Auto enthusiast (6), Truck enthusiast (4), Casual driver (3), Mechanic (3)

    Most Liked Positive Review

     

    1998 Jeep Wrangler Trac-Lok

    My 1998 Jeep Wrangler Sahara 4.0L has a Trac-Lok limited slip rear differential. The service manual requires that 4oz of limited slip lubricant be added to the 75W-90 gear oil. This Trans-X®...Read complete review

    My 1998 Jeep Wrangler Sahara 4.0L has a Trac-Lok limited slip rear differential. The service manual requires that 4oz of limited slip lubricant be added to the 75W-90 gear oil. This Trans-X® Posi-Trac® Limited Slip Gear Oil Additive meets the specifications for my Jeep. The pointed cap made it easy to inject into the differential through a 3-foot plastic tube.

    VS

    Most Liked Negative Review

     

    SAVE THE [$]!

    THIS WAS A TOTAL WASTE OF MONEY AND TIME. I HAD A SLIGHT CHATTER IN DIFF. WHICH IT SAID IT WOULD CURE. IT'S STILL THERE. JUST A BUNCH OF HYPE.

    THIS WAS A TOTAL WASTE OF MONEY AND TIME. I HAD A SLIGHT CHATTER IN DIFF. WHICH IT SAID IT WOULD CURE. IT'S STILL THERE. JUST A BUNCH OF HYPE.

    Reviewed by 11 customers

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    Displaying reviews 1-10

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    5.0

    Its an additive

    By Additive??????

    from Ft. Benning, GA

    About Me Casual Driver, Mechanic

    Verified Buyer
    Level 3

    Pros

    • Had To Use It
    • Perfect Amount

    Cons

    • Had To Use It

    Best Uses

    • Automotive Repair Shop
    • Home Garage
    • Roadside Repairs
    • Upkeep

    Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

    Chrysler has been making and using the 9.25 differential since the 60s. Now we need to add stuff to the oil. Seems like a gimmick. Don't want to be that guy who's diff falls out while driving because he wanted to save a buck and not get the additive.

    Comment on this review(earn points)

    (1 of 1 customers found this review helpful)

     
    5.0

    Great product

    By Silverstanger

    from Novi, MI

    About Me Auto Enthusiast, Casual Driver, Competitive Driver, Expert mechanic, Mechanic, Truck Enthusiast

    Verified Buyer
    3 or more reviews submitted

    Pros

    • Can Withstand Use
    • Easy To Use
    • Reliable

    Cons

      Best Uses

      • Automotive Repair Shop
      • Home Garage
      • Roadside Repairs
      • Upkeep

      Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

      If your rebuilding differentials or trying to quiet down a clattering diff... this is the stuff to get. Keep in mind synthetic gear lubricant contains proper friction modifier, so you don't want to go overboard with its use. I prefer this over the FoMoCo additive just based on sheer cost. And the storage tube is a handy shape that allows for easy application.

      Comment on this review(earn points)

      (1 of 2 customers found this review helpful)

       
      4.0

      Worth adding to gear oil

      By Rockgrabber

      from Kings Mountain, NC

      About Me Truck Enthusiast

      Ask me a question

      Verified Buyer
      Level 4

      Pros

      • Easy To Use

      Cons

        Best Uses

        • Home Garage

        Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

        Use if you have a slip differential in addition to regular gear oil.

        Comment on this review(earn points)

        (1 of 1 customers found this review helpful)

         
        5.0

        GREAT PRODUCT

        By Slow boat

        from Glen Spey N.Y.

        About Me Auto Enthusiast

        Pros

        • Easy To Use
        • It works

        Cons

          Best Uses

          • Automotive Repair Shop
          • Upkeep

          Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

          This product works great! I put it in a 1996 Impala SS that was making grinding an clicking noises when placed into reverse due to the limited slip. This product stopped all the noises immediatelly. Well worth the time to change the oil and add this.

          Comment on this review(earn points)

          (5 of 7 customers found this review helpful)

           
          5.0

          1998 Jeep Wrangler Trac-Lok

          By Home Mechanic - Do-It-Yourselfer

          from Charlotte, NC

          About Me Auto Enthusiast, DIY Mechanic

          Level 3

          Pros

          • Easy To Use

          Cons

            Best Uses

            • Automotive Repair Shop
            • Home Garage

            Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

            My 1998 Jeep Wrangler Sahara 4.0L has a Trac-Lok limited slip rear differential. The service manual requires that 4oz of limited slip lubricant be added to the 75W-90 gear oil. This Trans-X® Posi-Trac® Limited Slip Gear Oil Additive meets the specifications for my Jeep. The pointed cap made it easy to inject into the differential through a 3-foot plastic tube.

            Comment on this review(earn points)

            (3 of 9 customers found this review helpful)

             
            3.0

            Too soon to tell

            By Ken

            from Eatonton, GA

            About Me Casual Driver

            Verified Buyer
            Helpful Reviewer

            Pros

            • Easy To Use

            Cons

            • None

            Best Uses

            • Home Garage

            Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

            First time use. Seems to work. Time will tell.

            Comment on this review(earn points)

            (4 of 7 customers found this review helpful)

             
            5.0

            Great product

            By ram

            from Austin Tx

            About Me Auto Enthusiast, Mechanic, Truck Enthusiast

            Ask me a question

            Verified Buyer
            3 or more reviews submitted

            Pros

            • Compact Design
            • Easy To Use
            • Reliable

            Cons

              Best Uses

              • Home Garage
              • Upkeep

              Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

              This was a really good product for the price. It actually was such a good buy that I will use it as a preventative additive and for maintenance. I was not expecting it to work as well as it did, due to not knowing or hearing about it from anyone, except on the net. The product was not complicated, very easy to use and best of all inexpensive. This product did an outstanding job, which means I will not switch the whole rear end on the car I used it on. This saved me hundred of dollars if not more. I would recommend it to anyone before they decide to change their differential or rear end, like I was planning to.

              Comment on this review(earn points)

              (3 of 6 customers found this review helpful)

               
              4.0

              This stuff works!!!! Amazing...

              By 72stang

              from Hanover, Pa

              About Me Auto Enthusiast, Mustang Nut

              Pros

              • Awesome
              • Easy To Use

              Cons

              • None

              Best Uses

              • Auburn Posi
              • Home Garage

              Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

              I have a 72 Mustang Mach, I put in 389 richmond gears and a Auburn Posi in my 9"... it made lots of noise when doing slow turns.. sounds like a clicking or grinding... Added the TransX and the noise disappeared within 5 miles of driving...

              Comment on this review(earn points)

              (5 of 8 customers found this review helpful)

               
              5.0

              Works Great in 2006 Toyota Tacoma

              By V-Rod Mike

              from Jacksonville, FL

              Pros

              • Easy To Use
              • Reliable

              Cons

                Best Uses

                  Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

                  My Tacoma with a Limited Slip Differential rear end was making noise and chattering in low speed parking lot type manuvering, like lock to lock turns and backing into or out of parking spaces. I put a tube of this in and it fixed it 100%. I love this stuff and it was cheap.

                  Comment on this review(earn points)

                  (3 of 11 customers found this review helpful)

                   
                  1.0

                  SAVE THE [$]!

                  By MIKEY

                  from ROCKFORD

                  About Me Auto Enthusiast, Truck Enthusiast

                  Pros

                  • None

                  Cons

                    Best Uses

                      Comments about K & W Chemical TRANS-X Posi-Trac Limited Slip Gear Oil Additive:

                      THIS WAS A TOTAL WASTE OF MONEY AND TIME. I HAD A SLIGHT CHATTER IN DIFF. WHICH IT SAID IT WOULD CURE. IT'S STILL THERE. JUST A BUNCH OF HYPE.

                      Comment on this review(earn points)

                      Displaying reviews 1-10

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                      Do you have questions about this product?(earn points for answers!)

                       

                      Ask a question, get answers from real customers and in-house experts. Or contact Customer Care by email or call 1-877-238-2623.

                      7 Questions | 7 Answers
                      Displaying questions 1-7
                      • Q:

                        Would this be okay in a jeep wrangler with an Automatic aussie locker in the rear diff?
                        Asked on 5/13/2014 by Jeeper

                        1 answer

                        • CUSTOMER CARE

                          A:

                          Glad to assist, Jeeper! The Jeep does not have a Quadra Trac or Quadra Drive System, so it will be okay to go.

                          Answered on 5/14/2014 by Vincent from AAP
                      • Q:

                        I have a 2008 toyota tacoma TRD Sport 4WD with mechanical limited slip rear differential. I am replacing the gear oil and I want to know if I can use the Trans-X Posi-Trac Limited Slip Gear Oil Additive together with the Valvoline HP Gear Oil SAE80-W90 on my rear differential?
                        Asked on 4/29/2014 by John from Dayton, Ohio

                        1 answer

                        • CUSTOMER CARE

                          A:

                          Glad to assist, John! Posi Trac is compatible with synthetic and non-synthetic gear oils. We do not have documentation indicating that a differential modifier is required for your vehicle. If you owner's manual is indicating the need for an additive, the treatment issue is 1 tube per 1 gallon of gear oil.

                          Answered on 4/30/2014 by Vincent from AAP
                      • Q:

                        GM calls for the GM friction modifier, part # 1052271, for my rear axle. Is Trans-X additive equivalent to this GM product? Thank you.
                        Asked on 2/6/2014 by 77 Vette

                        1 answer

                        • CUSTOMER CARE

                          A:

                          I'm happy to help, 77 Vette! After some research I've found that this product meets GM Part No. 1052358 as a limited slip friction modifier. If you are replacing your differential fluid you may find that many of the fluids available contain a friction modifier already in the bottle to ease the filling process.

                          Answered on 2/7/2014 by Heath, ASE Parts Specialist from AAP
                      • Q:

                        would this be recomended for a 08 saturn outlook awd rear and transfer?
                        Asked on 2/21/2013 by pbro from hays, ks

                        1 answer

                        • CUSTOMER CARE

                          A:

                          This K & W Chemical Trans-X® Posi-Trac® Limited Slip Gear Oil Additive -part# 402508 is not vehicle specific. This is designed to help quiet chattering differentials and improve gear oil performance and is for use with conventional GL-5 or synthetic gear oils. For any further assistance, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

                          Answered on 2/22/2013 by Vincent from AAP
                      • Q:

                        You look on the back in small print, "NOT FOR USE IN JEEPS WITH QUDRA-TRAC OR QUADRA-DRIVE'. You should put instructions on your Advanced Auto Part.
                        Asked on 9/14/2012 by Jeep '05

                        1 answer

                        • CUSTOMER CARE

                          A:

                          We apologize for any inconvenience caused. We will forward the request to update this information on the K & W Chemical Trans-X® Posi-Trac® Limited Slip Gear Oil Additive (Part No. 402508) product description at the earliest. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have.

                          Answered on 9/15/2012 by John the Car-Doc from AAP
                      • Q:

                        Is this similar to the friction modifier that is used on the 04-8 Ford F150s real axle?
                        Asked on 3/9/2012 by scvfd02 from 28443

                        1 answer

                        • CUSTOMER CARE

                          A:

                          Yes, it is similar to a friction modifier. This K & W Chemical Trans-X® Posi-Trac® Limited Slip Gear Oil Additive with Part No. 402508 will significantly reduce the friction during break-in of differentials. High temperatures encountered in break-in can destroy the hardening of the gear teeth causing rapid wear of the softened gears. This additive can reduce the break-in temperatures by as much as 50°F, improving break-in conditions.

                          Answered on 3/12/2012 by John the Car-Doc from AAP
                      • Q:

                        Can I use this additive in my Jeep Liberty 4x4 2002? The rear end is chattering, so I want to replace the gear oil on it.
                        Asked on 10/28/2010 by Will from Miami, FL

                        1 answer

                        • CUSTOMER CARE

                          A:

                          From my experience in a lube/oil shop, we always put a limited slip gear oil additive in Chrysler/Dodge/Jeep vehicles.

                          Answered on 10/28/2010 by Mike the Auto Parts Master from AAP
                      Displaying questions 1-7

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