Chevrolet S-10 Forum : “Transmission sluggish - slows down after driving 50 miles”

Transmission sluggish - slows down after driving 50 miles

Hi, My Chevy S-10 pickup gets sluggish after driving about 50 miles (enigne gets
hot). It does not goes more then 60 miles (rpm starts to goes up). At times it
feels like engine is working really hard and something in transmission or after
that is holding it not to go easy even without load on truck. First, 50 miles it
cruise like a butter (300 rpm and 70-80 mph no sluggishness). Engine service light
came on. I have changed engine oil, fuel filter, air filter, tansmission oil was
changed 2 months ago. Lately, driving and towing a lot though.

Thanks!

Uttam