Merchant Automotive Maximum Allison Transmission Pro Series DIY Kit, LB7 | 2001 - 2002

LB7 Pro Series Transmission Kit
Fits 2001–2002 GM LB7 Duramax with Allison 1000 5-Speed

Built for power, tuned for performance — the Pro Series Transmission Kit is engineered specifically for 2001–2002 LB7 Duramax trucks that have been upgraded with aftermarket tuning, fuel system enhancements, and other performance modifications.

This kit transforms your Allison 1000 5-speed into a high-performance, high-capacity transmission capable of handling significantly increased horsepower and torque. It features upgraded GPZ frictions, performance-grade steels, enhanced pressure plates, molded pistons, and reinforced internal components — all designed to withstand the heat and stress of high-output builds.

The Pro Series Transmission Kit gives your LB7 the strength and reliability it needs to perform under pressure.

Kit Highlights

• Built specifically for 2001–2002 LB7 Duramax with Allison 1000 5-speed
• Designed for high-performance trucks with tuning and fuel system upgrades
• GPZ high-performance frictions for superior heat resistance and longevity
• Precision-cut steels and heavy-duty pressure plates for maximum holding power
• Molded clutch balance pistons and apply plates for optimized apply pressure
• TransGo shift kit and valve body upgrades for firm, responsive shifting
• Merchant Automotive deep pan with filter lock system
• Includes all essential bushings, bearings, gaskets, and internal upgrades

Kit Contents

• Clutch Packs & Friction Materials
• GPZ187 C1 Friction, Internal Spline x8
• GPZ192 C1 Friction, External Spline x8
• GPZ175 C2 Friction x7
• GPZ196 C3/C4 Friction x12
• C5 High Energy Friction x6
• C2 Steel x8
• C3/C4 Steel  x10
• C5 Steel x6
• C1 Alto Apply Plate
• C1 Alto Top Pressure Plate
• C3 Pressure Plate 
• C3/C4 Apply Plate  x2
• C3/C4 Molded Piston  x2
• Allison 1000 C3/C4 Piston Return Spring x2
• C1 Molded Clutch Balance Piston (5-Speed)
• C2 Molded Clutch Balance Piston (5-Speed)
• P1 Planet Shim

Transmission Internals

• Allison 5-Speed Overhaul Kit
• Allison T1 & T6 Bearing x2
• Allison T2 Bearing
• Allison 1000 T3–T5 Bearing x2
• Allison T4 Bearing
• Allison 1000 Front Pump Bushing
• Allison Stator Support Bushing
• Transfer Case to Transmission Adapter Gasket
• Pipe Thread Sealant Tape 
• Allison Cut Back Valve
• Allison 1000 P1 Drive Flange
• C1 Valve Kit – Quick Fill

Upgrades & Components

• Allison 1000 Deep Pan Kit with Merchant Automotive Deep Filter Lock
• PTO Billet Side Cover, Pro Series x2
• Transmission Pro Clutch Kit
• Transmission Sub Kit – LB7 A Kit
• TransGo Allison Shift Kit (5-Speed)
• Valve Body Kit (400–800 HP rating)
• Allison Pressure Switch Assembly
• Transmission Pressure Regulator Spring Service Tool
• Trim Springs “A” & “B” x2
• F-Trim Sleeve
• Allison 1000 Pass-Through Connector Body & O-Ring

Purpose-built for high-output LB7 trucks, the Pro Series Transmission Kit gives your Allison the internal armor it needs to hold added power, shift with authority, and stay cool under extreme loads. If you're pushing your Duramax harder, this is the transmission foundation you can count on.