Key Diagram & Connector Pinout Callouts
Hermetic seal connector linking cabin shifter & vehicle CAN to internal TCM
Dual 3/8-inch thermal bypass valve cooler supply and return ports
Slip-yoke output spline for 2WD or 4WD transfer case bolt adapter pattern
GM Hydra-Matic 8L90 8-Speed Automatic Transmission with Torque Converter
Manufacturer: General Motors OEM / Hydra-Matic • SKU: TRANS-GM-24291307-8L90
OEM Interchanges & Cross Reference
Mechanics can cross-reference with these stamped casing and manufacturer numbers:
Product Overview & Technical Description
Genuine brand-new GM OEM Hydra-Matic 8L90 transmission assembly shipped in factory reusable polymer transport crate. Engineered with four simple gearsets and five clutches (two brake clutches and three rotating clutches) delivering lightning-fast 100ms shift speeds. Fitted with latest revised internal fluid pump seal and updated Mobil 1 LV ATF HP compatible clutch friction materials.
Key Engineering Features:
- 100% brand-new OEM unit direct from GM transmission manufacturing plant (never rebuilt)
- Includes balanced triple-disc lockup torque converter pre-seated on input shaft
- Pre-installed internal electro-hydraulic Transmission Control Module (TCM) with updated solenoid body
- Filled with factory test charge; includes dipstick adapter plug and cooler line retention clips