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Thanks very much. Currently at 70 mph, I'm at about 1,750 RPM with 3.42. Sound about right by comparison?
If it's not towing heavy or pulling a big hill, which might unlock the tc or cause the trans to downshift, at 70mph the torque converter will be locked and trans will be in high gear.

Makes it straight math using the diff ratios to determine new rpm at 70.

(1750 / 3.42 ) x 3.73 = 1910

(1750 / 3.42 ) x 3.90 = 1995

(1750 /3.42 ) x 4.10 = 2100

etc.
 
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