[oldman3]

Got this info off of google, and I already knew part of this.

700R4 from 1982 till 1990, then 700R4 was renamed by GM in 1991 as the 4L60 (non elec) numbers and letters stood from 4 speed, L longitudinally and 60 as 6000 GVW. In 1994 the 4L60E was introduced. Depending on brand etc, these dates will very on when they were installed in vehicle. We now have 4L80E, 4L85E, and so forth. Hope this helps...Jim