8L45 Archives - Transmission Digest
New GM 8L45, 8L90 Zip Kits

Sonnax has introduced two Zip Kits that target the root cause of multiple shift-related complaints and converter-related complaints, respectively, by sealing the critical circuit pressure losses in the GM 8L45 and 8L90 valve body. Kit #8L45-8L90-SHIFT-ZIP helps prevent pressure loss within the signal accumulator, clutch control and 1-3-5-6-7 accumulator piston circuits. Kit #8L45-8L90-TCC-ZIP helps prevent

GM 8L45/90 1-3-5-6-7 Accumulator Piston Kit

Sonnax has introduced a new drop-in Zip Valve kit. The 1-3-5-6-7 accumulator piston kit (p/n 154740-15K) eliminates leaks in GM 8L45/90 units. This kit restores normal shift operation and feel while protecting against premature wear for lasting results.

TASC Force Tips: Diagnosing 8L45 & 8L90 Shift Complaints

Sometimes attention to the smallest of items can save you big dollars.