Seal - Trans Fluid Fill Tube

The Seal - Trans Fluid Fill Tube (MPN 1259475) is a genuine Chevrolet Performance transmission fluid dipstick seal engineered for reliable operation across various GM transmission applications. This small but critical component prevents fluid leakage around the dipstick tube assembly, maintaining proper transmission fluid levels and system integrity. Transmission fluid loss—even in small amounts—compromises hydraulic pressure and shifts quality, making this seal essential for any GM vehicle owner performing routine maintenance or rebuilding a transmission assembly.

Constructed from durable black rubber formulated to withstand high-temperature transmission fluid and repeated compression cycles, this seal creates a positive closure around the dipstick tube opening. The rubber composition resists hardening and cracking—common failure modes in aged seals—ensuring a long service life under both street and performance driving conditions. Its compact 2.55 x 1.6 x 3-inch form factor allows precise fitment without modification, and the minimal 0.02 lb weight reflects its purpose as a precision component rather than a structural element.

Mechanics and enthusiasts performing transmission servicing, fluid changes, or dipstick tube replacement benefit most from stocking this OEM part. Compatibility spans numerous GM transmission lineups, making it a universal solution for both vintage and modern Chevrolet, GMC, and Pontiac platforms. Installation is straightforward—simply slide the seal over the dipstick tube before reinstalling the assembly—and replacement is recommended whenever the seal shows visible cracking, hardening, or fluid seepage around the tube housing.