GM 4L80 transmissions came from the factory with one short (front) and one long (rear) cooler adapter. The longer rear fitting is required on the 4L80E for proper cooling and lubrication of the transmission. Check the thread size on your transmission before ordering. Note
- Some 1997 & later transmissions use 1/4-18 NPSM threads
- Some 2009 & later transmissions use 9/16-18 NPSM threads
