LB7 Work Series Transmission Kit
Fits 2001–2002 GM LB7 Duramax with Allison 1000 5-Speed
Unlock the true potential of your 2001–2002 LB7 Duramax with our Work Series Transmission Kit. Built around the proven Allison 1000 5-speed platform, this kit elevates durability and performance with upgraded clutch packs, improved hydraulic pressure, and reinforced internal components — all engineered to handle demanding workloads and increased horsepower.
This kit is an excellent replacement for a stock transmission, offering improved reliability and performance even in daily-driven, unmodified trucks. It’s also ideal for mildly upgraded builds, delivering the clutch capacity and shift quality needed to handle added power, especially with proper tuning and gearing.
Whether you're towing, commuting, or running a higher-output setup, this is the same proven configuration we use in-house on shop builds and real-world applications.
Kit Highlights
- Direct fit for 2001–2002 LB7 Duramax with Allison 1000 5-speed
- Ideal for stock or mildly modified trucks
- Increased clutch surface area for superior holding capacity
- Heavy-duty C1–C5 frictions and steels
- TransGo shift kit for improved shift quality and transmission longevity
- Merchant Automotive deep pan with filter lock system
- Includes all core bushings, bearings, gaskets, and valve body upgrades
Kit Contents
Transmission Internals
- Allison 5-Speed Overhaul Kit (2001–2002 LB7)
- T1 & T6 Bearings x2
- T2 Bearing
- T3–T5 Bearings x2
- T4 Bearing
- Front Pump Bushing
- Stator Support Bushing
- Transmission Adapter Gasket (Transfer Case to Transmission)
- C1 Valve Kit
- Pipe Thread Sealant Tape
- Allison Cut Back Valve
- Allison 1000 P1 Drive Flange
Clutch Packs
- C1 Frictions x6
- C2 Frictions x6
- C5 Frictions x6
- C3/C4 Frictions x9
- Alto Allison Piston Kit
- C1 Apply Plate x6
- C2 Steels x7
- C3/C4 Apply Pressure Plates x2
- C3/C4 Steels x7
- C5 Steels x6
Upgrades & Components
- Allison 1000 Deep Pan Kit w/ Merchant Automotive Deep Filter Lock
- PTO Billet Side Covers x2
- TransGo Shift Kit (5-Speed)
- Allison Pressure Switch Assembly
- Valve Body Kit
- Allison 1000 Pass-Through Connector Body & O-Ring
- F-Trim Sleeve
- Transmission Pressure Regulator Spring Tool
- Trim Springs “A” & “B”
Built for strength, tuned for performance — the Work Series Transmission Kit gives your early LB7 the transmission foundation it needs to perform reliably under load, shift confidently, and handle the power — whether you’re stock, towing, or running light upgrades.
