Depends on how much wiring you want, and if the trans has been rebuilt.
The 700r4 automatic was made until 88* replaced by the 4L60, until 93 or 94, when it was again replaced by the 4L60E. The E designates electronic shift control.
The 4l60 is basically the same as a 700r4, some minor internal changes, just a name change.
88* I've seen several different swap over years for when they called it the 700r4, or the 4L60, and vice versa.
In a 1/2 ton 2wd, any slightly built 700r4 will be fine, unless it's behind an LS, in which case slightly even more built may be better.
If I remember from my research, the cases will vary, and some years are better then others. This has to deal with valve body changes, and passage changes.
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