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700R4 differences


LawnSite Member
Does anyone know the difference between the versions of the 700R4 trans? I find different catalogs listing different parts with a changeover anywhere from 84 1/2 to 88, The most noteable difference is the # of splines on the converter input shaft. I ask because I have a 84 type in my truck that is on its way out, should I look for an 88 or later one to rebuild? Is there that much improvement in durability or anything else, or is there a reason I can't use one, like the speedo sensor issue, which I don't fully understand. Yes I will be buying a new TC also so I'd just buy whatever matches up, It seems the cases are all physically interchangeable.