Well, that was quick....
There were no significant exterior changes that were documented. There WERE internal revisions made a couple times, but you need to dissect the transmission and start taking measurements.
One thing that I didn't think of is that you can pull the driver gear that the speedometer cable attaches to and read the two numbers off the nylon gear itself (gives dimensions and tooth count). This will indicate if it is from a vehicle prior to or sold after 1989. Pre89's used a 32 tooth driven gear.
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