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Originally Posted by boomer62
I Have A 1999 Blazer 4wd, Automatic. About Once A Week When On The Thruway At 70 Mph, The Rpm Reads 2400. Normaly It Is At 2000. It Can Run Normal Rpm When I First Get On The Thruway And After The Tolls It Will Read 2400 Rpm Till I Get Off Or Within 5 Miles It Will Drop Back To 2000 Rpm. Other Times It Will Not Drop At All Till I Get Off. If I Drop It Down To 3 At 2000 Or 2400 Rpm It Reads 3000 Rpm For Both. Does Anybody Know What Is Causing This Problem ?
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It is just probly the way your tranny is shifting. Or you may be on the gas a little more than normal, or pulling a little heavy load.