Hello, I'm Danny.
Yes, only 1993 and 1994 4L60E transmissions will work. The 1988-1992 were 700R4 transmissions were a completely different style and the 1995 4L60E is a 1 year only. The 4L60 was redesigned 1996 and later and is computer controlled differently with OBD2 being introduced. I've attached a few steps below describing how to remove and replace the transmission in your truck. Hope this helps and thanks for using 2CarPros. Happy New Year.
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Sunday, January 3rd, 2021 AT 8:15 PM