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Old 04-27-2011, 09:09 PM
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MPG fix

2006 Grand Cherokee limited with the 4.7 V8. I live in the northeast and was thinking about removing the front driveshaft for the spring/summer to hopefully gain some mpg's. Does anyone know if this will help and/or cause some engine codes to come up?
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Old 04-27-2011, 09:16 PM
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Re: MPG fix

not possible
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Old 04-27-2011, 09:31 PM
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Re: MPG fix

There's a differential in the T-case. Kiss it goodbye.
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Old 04-28-2011, 09:02 AM
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Re: MPG fix

I don't have the quadra drive system so how is this going to ruin my t-case? I'm just disconnecting the power to the front differential.
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Old 04-28-2011, 12:11 PM
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Re: MPG fix

are you for real man? lol
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Old 04-28-2011, 12:24 PM
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Re: MPG fix

Just don't do it.
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Old 04-28-2011, 05:26 PM
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Re: MPG fix

Yes I'm for real. The jeep dealer I go to said give it a try and see if it helps. I don't understand how removing the front shaft will Destroy my t-case. Can someone explain why this would be bad.
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Old 04-28-2011, 05:56 PM
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Re: MPG fix

Iv seen alot of lifted 4x4 trucks do this but only with solid front axels.
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Old 04-28-2011, 06:09 PM
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Re: MPG fix

even if it could be done, it would not change the MPGs at all
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Old 04-28-2011, 06:37 PM
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Re: MPG fix

The dealer wasn't pulling your leg, was he? Maybe you could do it with the earlier command trac part-time 4wd (no diferential in the t-case). But with a full time QT2 like yours, the t-case differential will just send more torque to the missing front drive shaft. Or am I missing something here?
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Old 04-28-2011, 06:39 PM
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Re: MPG fix

I would have to agree that its not going to help enough to make it even remotely worth wild. Just unlinking the transfer case is not going to reduce the drag/friction you get from the rest of the assembly. That is what is decreasing you MPG.

You would have to completly remove the entire front axle assembly to eliminate all the points of friction created and we know that is not a real option.

I think you would gain just as much MPG by watching your driving style. Keep is slow and steady. Dont speed. The average vehicle MPG peaks around 60-65 mph, going any faster just reduces MPG.

Clean out any extra weight in your vehicle. There is no reason to carry around that 50 lbs set of golf clubs for months at a time. This goes for fuel as well, but some may disagree. Keep your tank at 1/2 full. No need to lug around 50-60 pounds of fuel you dont need when just driving around town.

I know with the rising price of gas we all want to save money, but I think the effort involved here really outweigh any gains you will get.

Most of these tips and more can be found here: http://www.fueleconomy.gov/feg/drivehabits.shtml
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Old 04-28-2011, 08:17 PM
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Re: MPG fix

just look at the RWD WKs, they get the same exact milage and they are even lighter because they lack the whole 4wd system.
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