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1998 Grand Charokee Laredo L6 4.0 242 : DANA rear sound


 
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keerthi
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Joined: 11 Jun 2006
Location: DC

PostPosted: Sun Jun 11, 2006 5:22 pm    Post subject: 1998 Grand Charokee Laredo L6 4.0 242 : DANA rear sound Reply with quote

Hi
98 Grand Charokee Laredo 2 wheel drive 105,000+ miles on it.

What DANA is it having?

what is the abbrivation for this model? jz/wj....I am new to this.
how to CHECK the gear oil?
how to change the gear ?
can i do it without Jacking it up?

it has following symptoms

sound toward the rear of the vehicle which pulses.
sound varies with: pressing gas paddle/RPM/road/speed.
but mainly varies with accelaration.

the noise is kind of wuf wouff wouf or guff guf guf

a small piece size of (half an inch) came out.

Rotars are some what ok.

Transmission is ok


I appriciate anybody giving suggestion on how to go about it. I have a long trip of 2400 miles next week.

Thanks

K
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nixt
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Joined: 17 Aug 2005
Location: Atlanta/Athens, Georgia

PostPosted: Mon Jun 12, 2006 12:32 am    Post subject: 1998 Grand Charokee Laredo L6 4.0 242 : DANA rear sound Reply with quote

Your '98 Grand Cherokee was the last year of the ZJ designation (1993-1998). Your rear axle is an aluminum Dana Spicer 44. You topic post is a little confusing; you stated 1998 Grand Cherokee Laredo L6 4.0 242- the 4.0 6 cylinder is a straight or inline 6 also known as an I-6. You also had "242" in the heading- the 242 is a designation of a transfer case; either NP 242 or NV 242. They are the same transfer case the company simply changed its name from New Process to New Venture. However you shouldn't have either one of them in your Jeep if it is a two wheel drive as you mentioned in your post. Your transmission is a 42RE and your rear axle gearing ratio could either be the standard 3.55 or the optional 3.73. For more information you should check out the Grand Cherokee Specs and FAQ thread at the top of the forum. I am posting some links below to help you find out more information about the specifications of your particular Jeep and to help you decipher your VIN code. In addition to the Jeep Horizons web pages and forums, the North American Grand Cherokee Association (NAGCA) is an excellent resource for technical information. As for checking the gear lubrication or changing the gears in your drivetrain, I imagine that it would be very difficult to get underneath your Jeep without jacking it or raising it up in some fashion because it will be very tight fit for you to crawl completely under the Jeep to do any type of serious work. Therefore, I would say that no you cannot really do the work without raising either the vehicle, axle, or wheels. To find out which gear ratio your Jeep has, you can jack the rear wheels off of the ground and manually rotate them and you should be able to approximate the gear ratio by counting the number of times the driveshaft spins in relation to the number of times you spin the rear wheel. In the tech section, there is an axle troubleshooting guide- if I were you, that is where I would start looking to try to diagnose the problem. I hope that this has been of some help to you.
-nixt

Another thought- you didn't mention if your Jeep came equipped from with the factory towing option with the receiver hitch. If it did, you will have the 3.73 gearing in the rear axle and it likely will have the Trac-Lok factory limited slip. However, if the fluid has not been changed in the differential at the appropriate intervals then the limited slip may no longer be functioning properly and therefore it will be acting like an open differential where only one wheel will spin when you step on the accelerator.

Links to look at:
http://jeephorizons.com/tech/axleguide.html
http://www.jeephorizons.com/tech/
http://www.jeephorizons.com/phpbb/viewtopic.php?t=989
http://www.nagca.com/
http://www.nagca.com/grandtech/Jeep%20Axel%20Transfer%20Case.pdf
http://www.nagca.com/grandtech/1998jgcspec.htm
http://www.nagca.com/grandtech/vin.htm
_________________
1998 ZJ 5.9 Limited W/242 swap
JKS disconnects & Garmin GPS
Heavy duty OME Suspension kit
with 2" coil spacers for 3.5-3.75 total lift
235/85R16 Goodyear MTR's Measure a true 32"

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Code3TJ
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Joined: 01 Jan 2004
Location: Uzbekistan

PostPosted: Mon Jun 12, 2006 1:22 am    Post subject: Re: 1998 Grand Charokee Laredo L6 4.0 242 : DANA rear sound Reply with quote

keerthi wrote:
a small piece size of (half an inch) came out.

A small piece of what came out of where? This is the basic concept for changing your fluid. To check the level, remove the fill plug and feel inside - the fluid should be at the bottom of the fill hole.
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