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Old April 21st, 2006, 06:39 AM   #1
Shakr
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Default driving without front drive shaft

I have a grand Cherokee with the full time 4wd , what kind of gas mileage increase would I see if I took the front drive shaft off ....would this effect / hurt any of the drive train ?.

These gas prices are killing me and this Jeep does not do so well in the MPG department.
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Old April 21st, 2006, 06:43 AM   #2
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From what I understand after 96 you can take it out without ill effects. 95 and earlier you will toast the 249. Taking the DS out won't do anything for your mileage. You're still turning the entire driveline, the only thing missing is the turning of the front shaft. You don't have lockouts so your front end is still all spinning an dragging just the same if you were pushing it with the DS.

I'm now at 4.10 and 285s. I get 14 in town and 16 on the highway.
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Old April 21st, 2006, 10:08 AM   #3
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There is one thing you can do, but Fred's point about pushing the front drivetrain still applies. You can swap in a NP242 for your 249. They were available in ZJ's via special order I believe? Either way, its becoming a popular swap not just because you get a 2wd option and still have the full-time option, but because its an alternative to the costly viscous coupling replacement in the NP249. I am not 100% certain, but you may not even have to disturb your center console. Ask Danno - he's done it in a ZJ.
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Old April 21st, 2006, 10:22 AM   #4
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Thanks guys for the imput , my GC is a gas hog and I dont know why.
it's a 98 with the 4.0 stock gearing and stock size tires and I think I'm getting about 14 -16 combined city/ hiway at best.

I have a hi flow cat, kn filter and a dynomax muffler on it and I never saw any increase in mpg with these changes. I don't drive it like a mad man but it see's a lot of drive time.

My saving grace is that I have a company gas card but if I can get better MPG then I can start pumping the extra gas into my other cars :)
and I'm sure my office manager is going to start questioning the amount of fuel I'm buying with the prices climbing.

Heck with this kind of MPG I should have kept the old pick up !!!
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Old April 21st, 2006, 10:52 AM   #5
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Quote:
Originally Posted by square eyed rio
and I'm sure my office manager is going to start questioning the amount of fuel I'm buying with the prices climbing.

I would think the opposite. That's justification for the higher expenditure. Pumping extra gas into the other cars is not going to help you with this. Are you going to tow your other car to the station with you or something? Additional small transactions might raise some eyebrows.
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Old April 21st, 2006, 11:20 AM   #6
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My thinking is if I currently do 2 fill ups a week at 45 - 50 bucks a fill up for the jeep but I can curb that to say 2 fill ups for a week and a half then every few weeks I can fill up my wifes car on that difference and it will still look like the typical 2 fill ups a week ...this ship I work for is a is a loosely built model and it does not have the manpower to hawkeye my every move but if I double my spending somebody may B!tch ....I'm sure soon the credit card will be taken away just like all the other perks over the years.

there was a time when a 1500.00 dollar tab at the boobie bar was not even an issue but now if I biggie size my happy meal some bean counter will squeal.
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Old April 21st, 2006, 11:56 AM   #7
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Quote:
Originally Posted by square eyed rio
but I can curb that to say 2 fill ups for a week and a half then every few weeks I can fill up my wifes car on that difference and it will still look like the typical 2 fill ups a week .

Yeah, until they look at the credit card activity and its a third transaction for a non-typical volume after business hours. Your plan is fine if they just continue to look at the bottom line. Pick a day when you may not have to drive as much and take the wife's car to work. Then you can better defend the charge if they get picky because you actually drove that vehicle in the course of doing your job and the fill-up would be during working hours.
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Old April 21st, 2006, 11:59 AM   #8
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FYI, I have a 98 5.2 and I replaced the 249 with a 242, I didn't see any gains in mpg's.
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Old April 21st, 2006, 02:16 PM   #9
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Not that I would promote this .........but you could think of starting to carry a 5 gal container with you.
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Old April 21st, 2006, 02:23 PM   #10
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Not that I would promote this .........but you could think of starting to carry a 5 gal container with you.


Hell yeah, there you go. Get a swing-out with a couple cans.
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Old April 22nd, 2006, 11:53 PM   #11
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Is this thread about removing a front driveshaft or how to swindle money from your employer? Just curious.
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Old April 23rd, 2006, 06:31 AM   #12
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Quote:
Originally Posted by HackSaw
Is this thread about removing a front driveshaft or how to swindle money from your employer? Just curious.
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