Some more info on identifying the right rack you need:
the 2 turns ratio rack for 84/85 has either AJ, AK, or YP embossed on the lower cap of the input pinion shaft
the 2 turns ratio rack for 86 and 87 had WT embossed on the lower cap of the input pinion shaft
the same for the 2.5 turns ratio racks in 84/85 are YM for 1 rack or CA or WL for the other rack. The difference between them I do not know, but they had different part numbers. For 86/87 the 2.5 turns rack had CA or WL embossed on the pinion cap.
I found this out while looking to replace my rack. I cheaped out and installed a good looking used rack. It was the correct one for Rick's adaptors but the year for it was unknown. A couple years later I am replacing it to correct a persistent slow leak - moral of the story: Do not cheap out! Get a rebuilt rack if you get a scrounged one.
Edit: the rack I used was the WT rack: 2 turns for 86/87. I really like it and replaced my leaky one with the same.
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Daviero - 88 N* GT
[This message has been edited by Daviero (edited 05-31-2010).]