I have an 83 300SD and it turns 3K RPM at 65 MPH. I sure wish I could slow the engine down a little. Is that feasable??

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1983 300 SD. 157K.
1964 Studebaker GT Hawk
1972 Corvette, Bought new
2007 Toyota Tundra
2007 Toyota 4 Runner
1993 Toyota Sequoia
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