Wix 58966 Transmission Filter Kit - Internal

WIX 58966 Transmission Filter Kit

The WIX 58966 transmission filter kit is built for heavy-duty automatic transmissions that need clean fluid flow and reliable sealing. It is designed for applications such as Chevrolet Silverado 2500 HD, Silverado 3500, GMC Sierra 2500 HD, and Sierra 3500 models with a deep pan.

Key Features

• Automatic transmission filter kit for heavy-duty service applications
• Application-specific filtration media helps keep unfiltered fluid from bypassing the filter
• Lock-seamed and sealed construction supports complete fluid filtration
• Includes sealing gaskets designed for modern transmission fluids
• High-strength, corrosion-resistant materials support long service life
• Recommended for OEM transmission filter change intervals
• Cross-references FRAM FT1229 for the same application

Detailed Description

WIX Part Number 58966 is a heavy-duty automatic transmission filter kit engineered for deep-pan applications. The filter uses application-specific media and sealed construction to help maintain clean transmission fluid flow, while the sealing components are matched to the demands of today’s transmission fluids. This makes it a direct service choice for Silverado and Sierra HD trucks equipped with the listed transmission configurations.

Compatible With 2001-2010 GMC Sierra 2500 HD, with Deep Pan; 2007-2010 GMC Sierra 3500 HD, with Deep Pan; 2001-2009 Chevrolet Silverado 2500 HD, with Deep Pan; and 2007-2009 Chevrolet Silverado 3500 HD, with Deep Pan. It also fits 2001-2006 Chevrolet Silverado 3500, with Deep Pan, and 2001-2006 GMC Sierra 3500, with Deep Pan. For Allison-equipped trucks, this WIX 58966 filter kit is listed for 2001 and 2003 Chevrolet Silverado 2500 HD and Silverado 3500 models with Deep Pan and Trans Mfr Code: Allison.

What It Helps Address

• Restricted transmission fluid flow caused by a loaded or worn filter
• Fluid bypass from poor sealing at the filter or gasket interface
• Service issues on deep-pan heavy-duty automatic transmissions
• Contamination buildup during routine transmission maintenance
• Fitment errors when replacing the transmission filter on HD GM trucks

Installation Notes and Tips

Verify the transmission pan style before ordering, since this part is listed for deep-pan applications only. Confirm the vehicle year, make, model, and transmission code where noted, especially on 2001 and 2003 Allison-equipped Silverado HD trucks. Replace the filter during scheduled transmission service and inspect the pan sealing surfaces before reassembly.

Quality Assurance

WIX designs its transmission filters with sealed assemblies and application-specific sealing components to support consistent filtration and leak-resistant operation. The brand recommends this filter for OEM transmission filter change intervals.