CHEVROLET GM 4L80E 1999 UP SUIT LS PATTERN PATTERN 4 SPEED
HAS EXTRA BOLT HOLE IN BELLHOUSING AT 12 OCLOCK POSITION
The 4L80E transmission, a four-speed automatic, can be identified by its “4-Speed, Longitudinally mounted, and for 8000 lbs” designation, and by checking for specific features like cooler lines and valve body characteristics.