Merchant Automotive Maximum Allison Transmission Pro Series DIY Kit, LML | 2011 - 2016

LML Pro Series Transmission Kit
Fits 2011–2016 GM LML Duramax with Allison 1000 6-Speed Transmission

The Pro Series Transmission Kit for the LML Duramax is engineered for trucks equipped with performance tuning, upgraded fueling, and heavy-duty demands. Whether you're towing, racing, or daily driving with added horsepower, this kit delivers the internal upgrades needed to handle higher torque loads and extended abuse—without sacrificing reliability.

With a full set of GPZ friction clutches, steel plates, upgraded pistons, bearings, and hydraulic upgrades, this is the complete performance rebuild solution for the Allison 1000.

Key Features

• Includes premium GPZ frictions and steel plates for increased clutch capacity
• Upgraded apply plates, pistons, and pressure plates for consistent holding power
• Merchant-exclusive filter lock system ensures consistent filtration under load
• Complete overhaul kit with all major wear and hydraulic components

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 
• C1 Apply Plate 
• C3 Pressure Plate 
• C3/C4 Apply Plate 
• C4 or 2/6 Clutch Backing Plate
• P1 Planet Shim

Internal Transmission Components

• Allison Piston Kit (2010+)
• Allison 1000 P1 Drive Flange
• Allison 6-Speed Overhaul Kit
• Allison T2 Bearing
• Allison 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

Built for Power. Engineered for Durability.
Whether your LML Duramax sees long hauls, drag passes, or weekend trails, the Pro Series Transmission Kit gives your Allison the clutch capacity and hydraulic support to perform consistently under pressure.