Products GM 8L45, 8L90 O-Ringed End Plug Kit Advertisement ByTransmission Digest on April 1, 2021 Sonnax introduces a new drop-in Zip Valve product: an O-ringed end plug kit (p/n 154740-17K). This easy-to-install kit puts an end to leaks, restores hydraulic integrity, and renews shift operation in GM 8L45 and 8L90 transmissions. AdvertisementClick Here to Read MoreAdvertisement Advertisement In this article:General Motors, General Motors 8L45/8L90 Transmission, Sonnax Industry News: Software Upgrade Helps Unlock Full Potential Diagnostic Platforms Industry News: GM 8L45, 8L90 Signal Accumulator Piston Kit Products: Transmission Jack Adapter for Heavy-Duty Clutch Assemblies Products: GM 8L45, 8L90 O-Ringed End Plug Kit Advertisement WEBINARS Watch a webinar for free on-demand! E-MAGAZINE Read the most recent edition of Transmission Digest. SUBSCRIBE Stay up to date by signing up for Transmission Digest newsletters.