Question about 2004 Jeep Wrangler

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Poor mileage(after 4" lift) and squeaks and rattles

Help ?! I am a proud "female" jeep owner who wants to learn everything I can in regards to taking care of the jeep I love. The job I've done for the last year requires a lot of driving on rough roads and I'm beginning to see the results. I know its not brand new anymore but what are ALL the things I can do to maintain my baby ? The doors and "other parts" of it squeak and rattle, the interior (although I thoroughly clean and vacuum it every other day) is filthy with dust as I have the top down as much as possible. Do I need to grease "things"? and what would those things be ? How bout tightening ? I REALLY need help and please dont tell me its too late. I've honestly done the best I can, I just need the knowledge.

Also (sorry), I recently saved up and put a 4" pro comp lift kit on it with 33 - 121/2 - 15 mud tires. I love it alot ! but... I seriously noticed a substantial difference in the amount of fuel I'm using. Aside from that... I dont often leave 4 th gear. The power just isnt there anymore, not the same anyway. What about this thing called "re-gearing" the "differentials" ?

Clearly I need a whole lot of help. Can you do it ? cause I really love my jeep and WANT to take care of it.

Thanks so much and Happy Friday ! Lorraine

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  • Rainy Rae Sep 06, 2008

    Jeep experts please...

  • Rainy Rae Sep 08, 2008

    WOW !!!! This guy is brilliant !!!! Extremely helpful. Thanks sooooo.... MUCH !!!!

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Any thing with bigger or flat wheels will give u more gas milaige

Posted on Sep 07, 2008

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Hi Lorraine,

I own a '91 Wrangler and an '86 Cherokee Laredo.

On the Wrangler I also upgraded the tires to 33".

I'll bet the first thing you noticed was the sluggishness. It didn't have the same 'get up and go'. Well, actually it does and that is the problem.

What happens with larger tires is not so much the weight but the strain on the engine. It's harder to turn a larger wheel. Like starting from a standstill in second or third gear. The engine isn't larger, the gearing hasn't changed.

Something else to think about. Your speedometer is no longer accurate. You're going faster than you think.

A larger tire, with larger circumference travels further per revolution. Your speedometer doesn't know that.

Click here for a calculator on just how much difference there is.

Yes you seem to be getting less MPG, but on the flip side you're going further and faster.

Click here for a calculator to determine optimum gear ratio

I didn't know your original sizes off the top of my head. The links provided should get you the info you need.

I must say, I was most impressed with your question (take a browse at some others, you'll know what I mean pretty quickly). You know what you want, you provide the info to get it. What a concept.

I know I only addressed one portion of your inquiry, but I thought I'd give you time to digest the content. If you'd like any additional info or for any reason at all, feel free to click the ASK button under my name. I'll do my best to help you out.

Only in a Jeep!!!

Mike

Remember: Good things come to those who rate!

Posted on Sep 07, 2008

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I'll address your question about power and mileage.
It's the unsprung weight you added to the Jeep.
Those 33 12's you added are a lot of mass to move, and moving them, is where your motor is using the additional fuel and power.
Re gearing? Well you can, but that's a double edged sword. You can put in a higher gear, wihich will help with the power (once you get it rolling). Lower gears? Will help the way it starts, but will cut off top end power, and really hurt the mileage.
You will probably be best with adding an overdrive unit.

Speaking of power, what motor is in it?

Squeaks and rattles.....
Yes, you can lube and spray everything in there, but it will always have some squeaks and rattles. It's kind of the nature of the beast. Adding the lift kit also didn't help. The lift kit will actually make it flex a little more.
Rattles are maddening. Best way to track them is with 2 people. Some one drive, some one listen and locate problems. Sound in a car can reflect all over. So once you actually where it is coming from, is when you can figure out the cure.

I've done off road vehicles for years. You will find, this is quite normal with them.

Posted on Sep 06, 2008

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As far as"greasing things" you can use a white lithium grease made by 3M in comes in a spray can and is fairly cheap. you can buy it at a local auto parts like Napa or Oreillys. you should also consider purchasing a repair manual for your jeep it costs about 20 bucks. this manual has diagrams,schematics and step by step instructions for all sorts of repairs yoy can do yourself,this by the way will save you quite a bit of cash on labor cost at a shop. If you have alot of sqeaks and such it maybe that the rubber bushings on your suspension and steering linkage are either dry rotted and need replaced or they are loose, so i would check that out. As far as re-gearing there bshould be no need to do so. I believe your performance issue is a matter of just tuning up your engine. there a number of things you can do to enhance the performance(the bigger the tires the less time it takes for the wheel to turn there for it actually saves gas and not the opposite) you can use a hotter burning spark so better plugs are an option. better plug wires is also a good idea they are thicker and don't allow for cross firing and they keep the whole spark consentrated with in the wire. change the fluids like you should. if the oil and trans fluid have lost their viscosity it causes friction and therefore you loose power. A final option is that you can add a performance chip to the main computer. This however requires you to take to a shop and have it hooked up to a diagnostic scan tool. This tool interfaces with the main computer and you can change the parameters of of how the engine and trnasmission performs. Hope this gives you the info you require...good luck please rate this (if you need any more answers to questions just click on my name)

Posted on Sep 06, 2008

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Its Going to cost a fair bit - ill get back to you see if i can get a better option for you that's cheaper

Posted on Sep 06, 2008

  • I no a person that works with these kinds of cars ill see what he suggest for you plz give me some time

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Lorraine you have to change the from and rear differentiel gears its lots of money but you put a higher you get more power but for gas milage i dont know

Posted on Sep 06, 2008

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Use in dust proof interior in ur jeep

Posted on Sep 06, 2008

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