Allison 1000 Transmission Service Kit 2001-2019 Duramax LB7/LLY/LBZ/LMM/LML/L5P

Service your transmission the right way with this BackWoods Diesel Allison 1000 Transmission Service Kit, designed for 2001–2019 Chevrolet Silverado and GMC Sierra 2500HD / 3500HD Duramax diesel trucks.

This kit is built to provide the correct amount of fluid and filtration components for routine maintenance on Allison transmissions using a standard (shallow) pan configuration.

At the core of this kit is Castrol TranSynd 668, a premium full synthetic transmission fluid specifically engineered for Allison transmissions, paired with your choice of a Genuine Allison or PPE Micro-Pure spin-on filter.

Base Kit Includes:
(2) Gallons Castrol TranSynd 668 Full Synthetic ATF
(1) Spin-On Transmission Filter (Select Option Below)
Genuine Allison Spin-On Filter
PPE Micro-Pure 10 Micron Spin-On Filter

Why Choose TranSynd 668
Castrol TranSynd 668 is a TES 668 approved full synthetic fluid specifically designed for Allison automatic transmissions.
- Fully backwards compatible with TES 295®
- Improved gear protection and reduced wear
- Extended anti-shudder and clutch durability
- Excellent thermal and oxidative stability
- Helps reduce operating temperatures
- Superior cold-flow performance for faster lubrication
- Maintains transmission cleanliness and extends service intervals

Features & Benefits:
- Complete base service solution for Allison transmissions
- Includes premium full synthetic fluid
- Choice of OEM or high-efficiency upgraded spin-on filter
- Helps extend transmission life and performance
- Designed specifically for Duramax / Allison applications
- Optional Add-Ons (Recommended)

Customize your service kit with these upgrades:
Internal Filters:
2001–2005 Standard Sump — 29537965
2006–2019 Standard Sump — 29542833
2001–2019 Deep Sump — 29542824

Additional Components:
GM Allison Transmission Pan Gasket — 29549684

Fitment: Allison 1000 / 2000 Equipped Trucks:
2001–2019 Chevrolet Silverado 2500HD / 3500HD — 6.6L Duramax (LB7, LLY, LBZ, LMM, LML, L5P)
2001–2019 GMC Sierra 2500HD / 3500HD — 6.6L Duramax (LB7, LLY, LBZ, LMM, LML, L5P)

Important Notes (Read Before Purchasing)
Designed for standard (shallow) Allison transmission pans
Standard pans require approximately 2 gallons of fluid for service

Pan Identification:
Standard pan = stepped/shallow rear section
Deep pan = flat bottom across entire pan

Fluid Capacity Notes:
Deep sump pans require additional fluid (typically +1 to +3 gallons depending on configuration)

Service Tip:
Do NOT allow the transmission to drain overnight
This can cause additional fluid to drain internally and require more fluid than a standard service