Sonnax 77731-04 Round Thrust Washer for GM 4L60 4L60-E 4L65-E 4L70-E Transmissions

The Sonnax 77731-04 round thrust washer is a precision-engineered replacement component designed for four-pinion rear planetary assemblies in GM automatic transmissions. This through-hardened steel washer provides a direct replacement for worn or damaged OE washers, helping to restore proper planetary operation and extend transmission life.

Key Features:

• Through-hardened steel construction for superior durability
• Engineered to eliminate needle roller thrust wear in planetary assemblies
• Direct OE replacement fitment for GM 4L60, 4L60-E, 4L65-E, and 4L70-E transmissions
• Also fits 700-R4 transmissions with four-pinion rear planetary configuration
• Sold individually or as part of Sonnax planetary rebuild kit 77731-RK

This round washer is a critical component in preventing planetary assembly failure caused by excessive thrust wear and inadequate lubrication. Sonnax transmission components are manufactured to OE specifications with enhanced materials for improved reliability during transmission rebuilds and overhauls.