How strong is a stock 83 5 speed.Were the
later trannies stronger?Can it be upgraded?

 

It's weak, don't abuse it. The 87 and later T5s were World Class and were somewhat stronger, but still weak. Upgrade to a T56 or tremec or richmond.

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84 Z28 L69. 5 speed with 3.73 posi (broken)Ported heads, intake, 10:1 comp. 230/230 .480 lift cam @.050"