ATP Parts JMS-25 Automatic Transmission Master Repair Kit

Automatic Transmission Master Repair Kit

ATP Parts JMS-25 is an automatic transmission master repair kit for full-service rebuild work. It brings together the friction and steel clutch plates, gaskets, seals, o-rings, sealing rings, sump filter, and commonly replaced bushings needed for a complete transmission overhaul.

Compatible With Chevrolet Express 2500, Chevrolet Express 3500, GMC Savana 2500, GMC Savana 3500, and other listed applications across 1997-2009 model years, this kit supports rebuilds on a wide range of GM trucks, vans, and SUVs. The ATP Parts JMS-25 is also listed for Bentley, Rolls-Royce, Cadillac, Hummer, Aston Martin, and Chevrolet/GMC heavy-duty platforms.

• Automatic transmission master repair kit for rebuild service
• Includes friction clutch plates and steel clutch plates
• Contains gaskets, seals, o-rings, sealing rings, and sump filter
• Includes commonly replaced bushings for transmission service
• Fits 1997-2009 Chevrolet Express 2500 and Express 3500 applications
• Fits 1997-2009 GMC Savana 2500 and Savana 3500 applications
• Part number: JMS-25

Detailed Application Coverage

ATP Parts JMS-25 is built for automatic transmission rebuilding where worn friction materials, hardened seals, and serviceable bushings need to be replaced together. The kit is listed across a broad range of vehicle applications, including 1997-2006 Chevrolet Silverado 1500, 2001-2006 GMC Sierra 1500, 2000-2007 Chevrolet Suburban 2500, and 2002-2004 Hummer H1. It also covers select Bentley, Rolls-Royce, Cadillac Escalade, and Chevrolet/GMC Classic models. Part number JMS-25 is a practical match for technicians handling high-mileage transmission service on GM truck and van platforms.

Common Problems This Kit Addresses

• Slipping or worn clutch packs during transmission rebuilds
• Fluid leaks from aged gaskets, seals, and o-rings
• Restricted flow from a dirty or worn sump filter
• Noise or wear related to serviceable transmission bushings
• Hard shifting caused by deteriorated internal transmission components

Installation Notes and Tips

Use JMS-25 during a complete transmission teardown and inspection. Replace all wear items at the same time, verify clutch clearances, and inspect hard parts, bushings, and sealing surfaces before assembly. Confirm the exact transmission code and vehicle application before installation, especially on Chevrolet Silverado, GMC Sierra, and Express/Savana models.

Quality Assurance

ATP Parts supplies this master repair kit with the core service components required for a quality transmission rebuild. The included friction and steel plates, sealing components, filter, and bushings are grouped to support a thorough internal refresh on the listed applications.