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john charlton · 09-25-2018, 09:26 AM

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.

09-25-2018, 09:26 AM	#2
john charlton Senior Member Join Date: May 2010 Posts: 1,304	Re: 30 PU max safe driving speed 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.