Quote:
Originally Posted by john charlton
I have a 30 pick up which is completely stock with the 3.78 rear end . It cruises very happily at 45 MPH . At 50 it is not so happy I can tell, this is for extended periods . With modern higher octane gasolene your truck will easily pull a 3.54 or even a 3.27 if you live in a flat area no long big hills. It might take some years but you will get your money back with way better gas mileage. Only the ring gear and pinion need to be changed nothing else.
John in lovely sunny afternoon Suffolk County England.
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Hi John,
Thanks for the info you provided.
I assume I have the 4.1, since I struggle to keep up with others. It is not happy/smooth at 40 and above, vibration, sounds busy. 55 mph (not KM) is max on the flat. Wisconsin has hills, minor, not even foothill type.
But some hills on secondary road will slow me down to 35-40 in 3rd.
The truck gets less than 500 miles a year - not too worried about cost, I also run ethanol free which is another 40 cents/a gallon. More of a concern where you are. If I remember correctly your gas is 3- 4 times as much as here in the States. Priced similarly as here except ours is per gallon, yours is per liter, a liter is about 1/4 gallon.
I am hoping others can definitively confirm where my motor is at 2200 RPM. The motor had a recent head gasket and valve job, the lower end condition is unknown. Babbitt's/rods/etc. work is expensive to have done.