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RE: Re: RE: M1009 Differential Mileage isnt all about lower gear numbers (higher ratios). You need to keep in mind that your engine wants to run at an optimal RPM. Take my 1009 for instance. I have stock 3.08 gears still, and the 700R4 transmission. At 65mph, I am running 1524 RPM. When...

RE: Re: RE: M1009 Differential I would say for 31-33" tires, you would be ok with 3.42 but 3.73 might give you similiar mileage, with better performance. If you go bigger than 33" tires, I would go 3.73 or 4.10's. HTH

Re: RE: M1009 Differential Hence the problem with the stock 3.08's If you have lifted, and put bigger tires on it, I would suggest 3.73 or 4.10. It all depends on what you have done to it. Bigger tires effectivly make the gearing even higher yet. Putting more strain on the motor, and IMO...

What have you done to it? I seriously doubt going to higher (ie smaller # than 3.08) is going to help you mileage at all.

Higher? or do you mean Lower? The 1009 uses the GM 10bolt axle.... they are a dime a dozen. You shouldnt have a hard time finding some 3.42 or 3.73 gears. I would suggest 3.42's if you are keeping the stock transmission, and 3.73's for with Overdrive.