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Old 08-04-2008, 08:23 PM   #1
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2008 Sprinter Rear Axle Ratio

The 2008 Sprinter has a 3.92:1 rear axle ratio. The 2006 Sprinter has a 3.72:1 rear axle ratio. Since the 3 liter diesel has 280 ft pounds of torque and the 2.7 liter diesel has 243 ft pounds of torque. It must be the engineer in me, but even with the larger 245/75-16 tires on the 2008 versus the 225/75-16 tires on the 2006, it seems Dodge (Mercedes) has going the wrong way on the rear axle ratio- they went for more performance and worse fuel economy. If you do the numbers the 2008 should have a 3.43:1 axle ratio to have about the same fuel economy as the 2006.

Has anyone with a 2008 Sprinter changed the rear axle ratio downward, .i.e, something less than 3.92:1, say 3.72 or lower? Changing the rear axle ratio is only the start- one must also change the computer chip or chip settings so the engine, transmission and speedometer know the correct axle ratio.

I am not interested in performance- read that acceleration, since most of my planned Sprinter driving will be on the highway.

Sinbad
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Old 08-04-2008, 09:57 PM   #2
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But torque does not equate to MPG so that is not necessarily an accurate comparison.
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Old 08-05-2008, 11:08 AM   #3
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Torque

I realize torque does not equal mileage, but torque does move the vehicle. Thus if the engine has more torque at a given RPM, then one should be able to reduce the rear axle ratio and still maintain the same speed on the same grade. Dodge did not do this with the 2007-8 Sprinter, they increased the rear axle ratio which give more power to pull a larger load or create higher acceleration. This also reduces mileage.

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Old 08-05-2008, 11:13 AM   #4
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Torque doesn't move the vehicle either, torque spins the transmission. There are a lot of factors that influence gas mileage, including computer programming of both the engine and the transmission.

What do the window stickers say for MPG on the different models?
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