The 81 code will make the trans go into "Limp Home Mode" which is 3rd gear (meaning plenty of slip and no power) and reverse only....if you have a VS it will be a 6HDD or 7HDD....both will fit and both will have the same number of pins - the VR 4/5/HDD will not fit and has the different number of pins. I seem to remember the VS has an extra pin. The actual code is stamped somewhere on the trans but I'm not sure...maybe do a search.
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