Rear Gear Determination

tomfla

New member
How do you determine the gearing of the rear end? I read the sticky about the 4.1 v 3.9 thing and definitely want the 3.9 for better highway mpg, but the guys at the auction just give me blank stares when I ask.
 

mean_in_green

>2,000,000m in MB vans
By auction do you mean buying used?

If so the axle label will long since have succumbed to the elements.

Only ways are VIN enquiry with a dealer or actually mark the prop and a tyre and carefully observe relative rotations. Just less than a ratio of four to one and you're in business!
 
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