98 eldorado vs. 97 sts

IVE GOT A 98 ELDORADO AND AT 2000 RPM THE CAR IS GOING ALMOST 80 MPH AND MY SON-IN-LAW HAS A 97 STS AND AT 2000 RPM THE CAR GOING 64. CAN ANYONE OFFER A REASON FOR THE GEARING DIFFERENCE THAT GM ENGINEERS PUT
INTO THESE CARS. THANKS
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Your son's STS is either stuck in 2nd gear, the tachometer is in need of adjustment/repair or he has a Tecumseh lawn mower engine.
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Don
Vancouver, USA
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