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Message: <blockquote data-quote="madokie" data-source="post: 4247221" data-attributes="member: 3462"><p>if the OP plans on doing plenty of highway driving,and no heavy low speed ,granny gear work ,,then putting a taller gear in the rear axle( 3.08,3.27),would be the cheapest way to go,along with taller tires.., if the OP also wants to keep the option of doing plenty of low speed work and highway ,, he could always add a Gear Vendors OD to the back of trans,, not cheap, 2000$, but they are bullet proof..but if good highway MPG is desired , get another truck ,that gets good MPG as is....modding your truck, engine, trans and rear axle can get time consuming, expensive, and may lead to unreliability....if OK ever goes back to doing vehicle inspections then a truck or any vehicle with a swapped engine may not be legal.and i would NOT modify your existing 5 speed trans,, not worth the $$$$ money..</p></blockquote><p></p>