Merchant Automotive Maximum Allison Transmission Pro Series DIY Kit, LMM | 2007.5 - 2010

LMM Pro Series Transmission Kit
Fits 2007.5–2010 GM LMM Duramax with Allison 1000 6-Speed Transmission

For LMM Duramax owners running higher horsepower from upgraded tuning, fueling, and hard-working applications, the Pro Series Transmission Kit is engineered to handle the increased demands. This complete rebuild kit delivers the holding power, reliability, and internal upgrades necessary to support performance use without sacrificing drivability.

Packed with premium GPZ frictions, precision steels, and upgraded apply components, this kit strengthens key areas of the Allison 1000 to handle additional power with the confidence needed for towing, daily driving, and competition.

Performance Benefits

• Engineered for modified and tuned LMM Duramax trucks
• High-capacity GPZ friction materials for improved torque handling
• Reinforced pressure plates, pistons, and return springs for durability
• Merchant-exclusive filter lock system ensures filtration under extreme pressure
• Complete internal refresh with all critical wear components included

Kit Contents

Friction & Steel Components

• GPZ187 C1 Friction, Internal Spline x8
• GPZ192 C1 Friction, External Spline x8
• GPZ175 C2 Friction x7
• GPZ196 C3/C4 Friction x12
• C2 Steel x8
• C3/C4 Steel x10
• C5 Steel x6
• C5 High Energy Friction x6
• C1 Alto Top Pressure Plate (.450" Thickness)
• C1 Apply Plate 
• C3 Pressure Plate
• C3/C4 Apply Plate Cut for LML Piston x2
• C3/C4 Molded Piston Set (Allison Piston Kit)
• C3/C4 Piston Return Spring x2
• P1 Drive Flange
• P1 Planet Shim

Internal Transmission Components

• Allison 6-Speed Overhaul Kit
• Allison T2 Bearing
• Allison 1000 T3–T5 Bearing
• Allison T4 Bearing
• Allison T5 Bearing
• Allison 1000 T1 & T6 Bearing x2
• Allison 1000 Front Pump Bushing
• Allison Stator Support Bushing
• Transfer Case to Transmission Adapter Gasket
• Pipe Thread Sealant Tape 
• Allison Cut Back Valve

Upgrades & Tools

• Allison 1000 Deep Pan Kit with Merchant Automotive Deep Filter Lock
• PTO Billet Side Cover, Pro Series x2
• TransGo Allison Shift Kit (5-Speed Control)
• Valve Body Kit 
• Allison Pressure Switch Assembly
• Transmission Pressure Regulator Spring Service Tool
• Trim Springs "A" and "B" x2
• Allison 1000 Pass Through Connector Body and O-Ring

Proven under pressure — built for power.
The Pro Series Transmission Kit for the LMM provides the critical clutch and hydraulic upgrades needed to put down power reliably. Whether you're towing heavy, racing, or daily driving with performance tuning, this kit ensures your Allison stays in the fight.