Allison Service Package, 2001-2019 LB7/LLY/LBZ/LMM/LML/L5P

Part# Allison Fluid/Filter Package


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Fits: 2001 thru 2019 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY/LBZ/LMM/LML/L5P Duramax Diesel

DmaxStore has put together this great package for our members to correctly service their Allison transmission.  These kits provide the correct amount of fluid and spin on external filter for 2001-2019 Duramax diesels using standard Allison transmission pans.

Castrol TranSynd 668 is a premium, full-synthetic automatic transmission fluid specifically formulated for Allison Transmission® on-highway automatic transmissions. TranSynd 668 provides oxidative stability, anti-wear performance, and friction durability, as well as TES 668™ specification differentiators such as extended anti-shudder durability and extended clutch friction durability. This fluid features an Allison TES 668 approval. The TES 668 spec is fully backwards compatible for TES 295® applications.

Base Kit includes:

  • 2 Gallons of Castrol TranSynd 668 Full Synthetic Fluid, which was specifically designed for the Allison Transmission. We have found this fluid to be far superior and completely compatible with Dexron 3 and Dexron 6.
  • 1 Genuine Allison spin on transmission filter


  • Delivers improved gear protection.
  • Delivers extended anti-shudder durability.
  • Delivers extended clutch-friction durability.
  • Excellent corrosion and foaming resistance.
  • Excellent thermal and oxidative stability that helps to prevent deposits and oil thickening.
  • Excellent transmission cleanliness under all conditions permits extended oil-drain intervals and decreased
  • Excellent temperature reduction through reduced friction leads to longer oil and component life.
  • Outstanding cold-flow properties enable faster oil flow to all critical components, particularly during cold starts.
  • Optimized frictional characteristics gives smoother gear changing at all ambient temperatures and load
  • Excellent shear stability properties help to retain full transmission performance over the entire oil-drain interval



Standard vs Deep Allison Pan: The Standard Allison Pan will become shallower towards the rear of the transmission, while the Deep Allison Pan will have a flat bottom. Standard Allison pan will take 2 gallons of Transynd, Allison Deep Sump pan will take an extra gallon. Aftermarket Deep Sump Pans will take 2-3 extra gallons depending on what aftermarket pan you have.


Documents from Allison: BrochureCharacteristics

Customer Reviews

Based on 4 reviews Write a review

Customer Reviews

Based on 6 reviews
Steven Holm
Super convenient

Great price compared to getting this stuff locally. Very convenient to be able to buy the package.


Drain and refill, easy!

Brad Carney

Everything you need to service your transmission in one package with fast shipping!


Third time ordering this and both times I received it much faster than I expected. Great deal considering what this fluid does to help bring my trans temps down. Running 235K mile LBZ and I saw 10 degree drop after using it the second time for the full flush.

Jesse James

Supper fast shipping! Showed up at my door less then 24 hours. Great parts, have used this stuff for awhile and have 440k on original transmission hauling everything you can think of. Also great support. Thanks Chad!