Allison 4000 Series Transmission Adaptation Kit – for Caterpillar Big Block Engines.
This transmission adaptation kit enables seamless integration of any Caterpillar Big Block engine with an Allison 4000 Series automatic transmission. It is compatible with engines ranging from the early 5EK 3406E through all C15 variants (Single Turbo, Twin Turbo/ACERT, and SDP). The kit is commonly used for manual-to-automatic conversions or when replacing a faulty manual transmission.
Kit Includes:
- (1) Ring Gear Adapter Assembly
- (1) Wear Plate
- (3) Flex Plates
- (1) Flex Plate / Bolt Plate Assembly
- (1) Hub Adapter
- (12) Bolts (Hub Adapter to Crankshaft)
- (24) Bolts (Flexplate to Ring Gear and Ring Gear to Torque Converter)
Compatibility:
- Caterpillar Big Block engines including:
- 3406E (5EK and later)
- All C15 variants (Single Turbo, Twin Turbo ACERT, SDP)
- Allison 4000 Series automatic transmissions
- Any chassis configuration
Important Notes:
- Designed specifically for Caterpillar Big Block engines paired with Allison 4000 Series transmissions.
- Contact Kustom Truck with your engine serial number to confirm exact compatibility and programming needs.
Key Specifications:
- Complete hardware set for flexplate and adapter installation
- Enables reliable automatic transmission integration
- Improves driveability, control, and fuel efficiency
