Pete M Posted August 23, 2021 Share Posted August 23, 2021 I do believe there's a link to a speed gear chart in the link in my signature. it's pretty simple to swap once you figure out which one you need. Link to comment Share on other sites More sharing options...
pizzaman09 Posted August 26, 2021 Share Posted August 26, 2021 On the drive from southern California to Northwest Pennsylvania my Comanche averaged 21mpg. Average speed was high and including the high elevation drive through Colorado and then the following day with engine pinging in Kansas due to the low 85 octane Colorado fuel. 1988 4.0L, BA10/5 trans, 4x4 short bed. 205/75R15 tires, and 3.08 axle. It had a Banks header and a brand new catalytic converter. Link to comment Share on other sites More sharing options...
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