how many rpm should engine be turning going 60 mph with 3.8 with 4 speed automatic transmission?
Around 2,000 rpm.
My old Park Avenue turned 1800 at 60MPH.
about 1750-1800 at 60mph is the rpms when the engine reaches 2000 rpm it should shift.
Looking for a Used LeSabre in your area?
CarGurus has 1,215 nationwide LeSabre listings starting at $799.
Search Buick LeSabre Questions
Buick LeSabre Experts