First question, does the VSS control the speedo? I think so but just covering all bases here. I have a TH350 with a speedo cable, but, I need the VSS so I can run it with my LT1 in my '89 Firebird.
Not sure about '89's, but '87 GM's have the VSS unit behind the dash and the speedo is still cable operated. The VSS sends a signal to the ECM for TCC lockup and (possibly) other functions. You should be OK, but consult a shop manual to be sure...
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