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.
Hydraulics Fundamentals: Accumulators & Shift Feel
Accumulators and their circuits have been used for years as the primary method for controlling shift feel. These components are designed to modify a shift by essentially acting as a shock absorber for the fluid pressure that is applying a clutch, brake or band. Cushioning of this high pressure allows the apply component to engage gradually, instead of slamming on and rattling parts and bones alike.
TF-60SN Accumulator-Body Caution
So you’ve got it figured out. The cause of that TF-60SN converter issue you’ve been fighting has finally been narrowed down to wear in the lockup-clutch control bore. Well, before you reach for that pot of gold at the end of the rainbow, here are a couple of things you should know.
Easy Fix for 4T60-E Accumulator-Housing Pin Wear
Accumulator-piston wear is common and fixes are readily available, but the little pocket where the piston pin sits in the accumulator housing also wears, and this is a more-difficult problem to solve. This article describes a way to salvage accumulator housings using parts and tools you have lying around in your shop.