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Q: when driving 40 m.p.h. the tach is @ 3,500, is this normal? on 1993 Cadillac Seville STS

Tach red-lines @ 6,500+, what is the deal with these Northstar engines? Are they reliable?
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Have transmission checked! It is either slipping or in a lower gear with that many rpm @ 40 mph.
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