Merchant Automotive Maximum Allison Transmission Pro Series DIY Kit, L5P | 2017 - 2019

L5P Pro Series Transmission Kit
Fits 2017–2019 GM L5P Duramax with Allison 1000 6-Speed Transmission

The Pro Series Transmission Kit for the L5P Duramax is built for trucks that work hard and play harder. Whether you're pushing higher horsepower through tuning and an upgraded turbo or just want added reliability for towing and hauling, this comprehensive kit brings together the proven clutch materials, hydraulic upgrades, and hard parts needed to reinforce the Allison 1000.

Our kit increases clutch surface area, improves piston apply pressure, and includes essential reinforcements to help your Allison live longer under load.

Key Features

• Uses GPZ high-performance friction material
• Reinforced clutch apply components for greater holding power
• Merchant-exclusive filter lock system and upgraded PTO covers included
• Comprehensive overhaul parts for complete transmission refresh

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 (Rated for 400–800 HP)
• 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

More Power. More Holding. More Confidence.
Give your L5P’s Allison the capability to handle additional performance and heavy-use demands with the Pro Series Transmission Kit—your all-in-one solution for increased clutch capacity, precision hydraulics, and long-term reliability.