Well, guess I'll kick some of my own dust. I didn't want to get into a long detailed chronology of the 700R4 - but . . .
Up to 1985 the trans had some severe weak spots and updating requires major hardware. Late 85 it was greatly improved.
Mid 1988 model-year - a few more refinements added that enhanced it, and in the next few years a few more - all pretty much minor.
Speaking in general terms - late 85 and up was pretty relable - but at this time much of this is moot. I'll assume most transmissions from the 80s that are still out there have probably been rebuilt at least once and upgraded. Lockup converters are the same from 1982 to 1995 as long as 30 spline and NOT the early 27 spline - or a few rare 6 lug diesel converters. For the most part - for any trans that has rebuilt/upgraded properly, 85 to 91 are pretty much the same in regard to durability.
In regard to transmission controls - lockup control is easy added with - either some homemade wiring or some cheap aftermarket kits.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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