rickyt
50 should not be a strain on your old truck. Lots of variables as don suggested. I've had my 50 3600 with 216, 4.57 gears and 7.00-15 tires up to 55 multiple times. Doing the math indicates RPM's at 2850. It was loud! But ran fine.
Now, why it didn't want to go over 40 on the trip home I don't know. How was it running? Did it stumble, cough or miss? Or just not take gas.
