1 Set 5-Speed Shift Solenoid Kit Allison Transmission 1000/2000 For 1999-2005 - Duramax Applications 116420A This 5-speed shift solenoid kit is designed for Allison Transmission 1000/2000 models used in 1999-2005 Duramax applications.It includes 7 essential solenoids engineered to restore and improve transmission shifting performance.The components are built to meet OEM specifications, proper fit and function for.Each solenoid is constructed to support consistent shift control and enhanced transmission response under heavy-duty conditions.The kit supports a complete shift solution and is suitable for use during transmission maintenance or rebuilds.Installation is straightforward with included instructions, allowing for efficient setup without specialized tools.Designed for both professional mechanics and DIY users, this solenoid set provides a practical upgrade for transmission performance and durability in demanding applications.