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 Details  
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

No 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

 

Works Great in 2006 Toyota Tacoma

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. ...Read complete review

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.

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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(6 of 12 customers found this review helpful)

 
5.0

Its an additive

By 

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)

(5 of 10 customers found this review helpful)

 
5.0

Great product

By 

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)

    (7 of 13 customers found this review helpful)

     
    4.0

    Worth adding to gear oil

    By 

    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)

      (7 of 13 customers found this review helpful)

       
      5.0

      GREAT PRODUCT

      By 

      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)

        (11 of 20 customers found this review helpful)

         
        5.0

        1998 Jeep Wrangler Trac-Lok

        By 

        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)

          (9 of 21 customers found this review helpful)

           
          3.0

          Too soon to tell

          By 

          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)

          (10 of 18 customers found this review helpful)

           
          5.0

          Great product

          By 

          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)

            (9 of 18 customers found this review helpful)

             
            4.0

            This stuff works!!!! Amazing...

            By 

            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)

            (13 of 22 customers found this review helpful)

             
            5.0

            Works Great in 2006 Toyota Tacoma

            By 

            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)

                (9 of 22 customers found this review helpful)

                 
                1.0

                SAVE THE [$]!

                By 

                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.

                    11 Questions | 11 Answers
                    Displaying questions 1-10Previous | Next »
                    • Q:

                      CAN I USE FOR MY 97 GRAND CHEROKEE LAREDO JEEP
                      Asked on 7/28/2015 by KILEY

                      1 answer

                      • CUSTOMER CARE

                        A:

                        Yes, Kiley, you can use this K & W Chemical Trans-X® Posi Trac® Limited Slip Gear Oil Additive, 7 oz. (Part No. 402508) in your 1997 Jeep Grand Cherokee Laredo. Note: Not for use in Jeeps with QUDRA-TRAC OR QUADRA-DRIVE.

                        Answered on 7/28/2015 by Steve from AAP
                    • Q:

                      CAN I USE THIS ON MY 2005 SIERRA DENALI >? FRONT DIFF? TRANSVERES CASE>? AND TRANSMISIION>? ALL THREE CAN I ADD RHIS TOO>? HELLO? THANKS BIGDADDYCAINE44!!!$$$
                      Asked on 4/8/2015 by BIGPAAPAPUMP!! from TRUMBULL CONN

                      1 answer

                      • CUSTOMER CARE

                        A:

                        I'm happy to help, BIGPAAPAPUMP!! K & W Chemical Trans-X® Posi Trac® Limited Slip Gear Oil Additive (Part No. 402508) is engineered for use in limited slip differentials and is an equivalent to GM Part No. 1052358. This product is not intended for use in your transfer case or transmission. It is to be mixed with 75W-90 synthetic axle lubricant.

                        The transmission in your 2005 GMC Sierra Denali 6.0L V8 utilizes Dexron VI, such as CARQUEST Oil & Fluids Dexron VI (ATF) Automatic Transmission Fluid (Part No. CQ426).

                        The manual transfer case uses GM Part No. 88861800 or equivalent, such as a Dexron III automatic transmission fluid (CARQUEST Oil & Fluids Part No. CQ420 [1 qt] or Part No. CQ420-1G [1 gal]). The automatic transfer case utilizes Auto-Trak II GM Part No. 12378508 or equivalent.

                        Answered on 4/8/2015 by Heath, ASE Parts Specialist from AAP
                    • Q:

                      CAN YOU USE THISA IN THE TRANSEVERE CASE ON A 2005 SIERRA DENALI?? AND THE FRONT DIFF? AND THE TRANNY??? THANKS !!!
                      Asked on 4/8/2015 by BIGDADDYCAINE44 from BRIFDGEPORT CONN

                      1 answer

                      • CUSTOMER CARE

                        A:

                        Happy to help you with your question! This additive is compatible with your vehicle and is comparable to the GM Friction Modifier. On the front of the label it references that it is comparable as well and is usable in the front, rear, and transfer case.

                        Answered on 4/8/2015 by Panda from AAP
                    • Q:

                      I know what kind of gear oil I need, a little confused on how many, I have the Haynes manual and it says 3 pints beside Durango, then it has rear axle 8 1/4 in.4.4 pints, 9 1/4 in. 4.8 pints. I have a 99" dodge Durango v8 2wd 5.2l, so how many do I need?and will one bottle of k&w chemical trans-x posi track limited slip Additive be enough?
                      Asked on 3/17/2015 by tmc

                      1 answer

                      • CUSTOMER CARE

                        A:

                        I'm glad to assist, TMC! Your 1999 Dodge Durango 2WD 5.2L V8 requires 4.6 pints in the 8-1/4 differential and 4.8 pints in the 9-1/4 differential. Your vehicle requires 5 ounces of Mopar Friction Modifier (Part No. 4318060) or equivalent. This K & W Chemical Trans-X® Posi Trac® Limited Slip Gear Oil Additive will be more than enough.

                        Answered on 3/18/2015 by Heath, ASE Parts Specialist from AAP
                    • 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
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