Whats the difference between the 4L60 and 4L60E transmission?
The 1993 cars came with the 4L60 automatic transmission while the 1994’s and later got the electronic version (4L60’E’). The 4L60E got an electronic valve body which can vary the shifts and feel dynamically to meet the existing driving conditions. Actually, if you drive a ’93 and ’94 (under normal conditions), there is a noticeable difference in that the 93 shifts are much more firm and abrupt. The 94 (and later) have a “variable” feel depending on throttle position, which of course at wide open throttle, feels like the 93. This electronic valving is also supposed to reduce the wear over the life of the transmission. If you have a 93, you might want to try driving in 3rd (or “D” on the Pontiacs). Once the revs get to high in 3rd, put it into 4th (or “OD”) manually. Due to the valving, the shifts should be much firmer at all times in 3rd than 4th.
