Allison 900hp rebuild kit

TDP Allison 1000 Stage 3 Extreme Duty Transmission Package 

If you’re making real power or putting your truck to work every day, the factory Allison won’t survive. This package is built to fix that.

The TDP Stage 3 Allison 1000 Extreme Duty Package is a complete, fully upgraded transmission solution designed to handle high horsepower, heavy towing, and aggressive driving without compromise.

Every known weak point in the Allison platform is addressed—from clutch capacity to hard parts to hydraulic control—so you can push your truck without worrying about the transmission being the failure point.

  What’s Included

Hard Part Upgrades (Strength Where It Matters)

• 300M Billet Input Shaft – Eliminates factory shaft failure under high torque
• P2 Planetary Carrier Upgrade – Increased durability in high-load conditions
• C2 Clutch Hub Upgrade – Prevents spline and hub failure
• C3/C4 Retainer Assembly  – Reinforced for higher clutch load
• Goerend PTO Cover – Improved oiling and strength under stress

Clutch System (Full GPZ Performance Stack)

• C1 GPZ Frictions & Steels
• C2 GPZ Frictions & Steels
• C3 GPZ Frictions & Steels
• C4 GPZ Frictions & Steels (Modified)
• 5-Clutch Module Upgrade – Increased apply area and holding capacity
• Overhaul Kit w/ Bonded Pistons – Eliminates common seal failures and improves clutch apply integrity

Hydraulic & Valve Body Control

• RatioTek Performance Kit
  • Increased line pressure capability
  • Faster, more controlled shifts
  • Eliminates slip, flare, and clutch burnout

Converter & Fluid Control

• Performance Allison Torque Converter – Built for high load lockup and durability
• Deep Transmission Pan – Increased fluid capacity and cooling
• Spin-On Filter + OEM Allison Filter (White) – Proper filtration for long-term reliability

Internal Refresh Components

• Complete Bearing Kit
• Complete Bushing Kit

Electronics

• Updated Gray Internal Wire Harness – Fixes common electrical failures and ensures proper communication