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 NP231 Problems

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TOYZ_2
Walks The Walk
Walks The Walk
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Number of posts : 190
Age : 51
Location : Schertz, TX
Rig : 98 TJ 4 Banger
specs. : 3 1/4 RC lift, bestop supertop, round tires , dual sun visiors
Registration date : 2008-08-10

PostSubject: NP231 Problems   Wed 16 Mar 2011, 10:09 am

Wanted to throw this out for some of you more experienced troubleshooters. My son woke me up yesterday and said his 99 TJ was making a noise underneath the Jeep. Went for a very short test drive and the noise is metal sounding as you drive. Got underneath to check U joints and all appear in good shape. From the sound it was making and doing some research on the internet, pretty much sounds like Transfer case problems. We did change the fluid about 5 months ago with chrysler atf+4. My question , is this maybe a chain with slack hitting the bottom of the case or are we looking into major stuff here. Wondering if we caught this early enough to lessen the damage before the entire thing explodes. Jeep is on house arrest untill repairs can be done. Just wanting some feedback. Thanks.....
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r_unda
Seasoned Vet
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Number of posts : 794
Age : 34
Location : Corpus Christi, TX
Rig : 1998 Jeep Wrangler
specs. : 2.5L-4 Cyl., 33x10.5 BFG's Mud tires, 2.5 in. lift springs, 1.25 in. BL, 1 in. MML, 4.88 Gears, Front Powertrax No-Slip, Rear E-Locker, Chromoly axle shafts, SYE, Tera Low & 2Low, UCF Tummy Tuck, etc
Registration date : 2010-03-12

PostSubject: Re: NP231 Problems   Wed 16 Mar 2011, 5:37 pm

Start by disconnecting the front driveshaft. Drive it without it. If sound still there, put it back and now take the rear driveshaft out. Drive it in 4x4. Hopefully is just the u-joint.

If not, working on the NP231 is easy. I just installed a teralow and sye on mine. No special tools needed. It might just be one of the bearings and if I remember right you can replace them (two) without taking everything apart.
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Chris
Got No Life
Got No Life
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Number of posts : 962
Age : 42
Location : San Antonio
Rig : 1990 XJ Trigger
specs. : 4.5in. Rubicon Express lift. JCR front winch bumper. Warn 9in. dual beam lights. PIAA 520 ATP Extreme White lights on Conn Ferr Roof Rack. Cooper STT 285/75/16 on Moab rims. Ramsey 8000 winch. 4:10 G2 gears. Aussie 30 locker, and Detroit Tru Trac locker Dana 44. Poison Syder diff covers
Registration date : 2010-10-19

PostSubject: Re: NP231 Problems   Wed 16 Mar 2011, 9:06 pm

Could be a very slack chain.
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SBC_Tim aka thebigtman
Got No Life
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Number of posts : 944
Age : 42
Location : La Vernia, TX
Rig : YJ/TJ, V8, tons
Registration date : 2009-09-04

PostSubject: Re: NP231 Problems   Thu 17 Mar 2011, 10:19 pm

You can also just drain the fluid and see how much metal comes out.

Pinpointing noises from underneath the Jeep can be deceptive. Work methodically and you'll find it.
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TOYZ_2
Walks The Walk
Walks The Walk
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Number of posts : 190
Age : 51
Location : Schertz, TX
Rig : 98 TJ 4 Banger
specs. : 3 1/4 RC lift, bestop supertop, round tires , dual sun visiors
Registration date : 2008-08-10

PostSubject: Re: NP231 Problems   Sat 19 Mar 2011, 12:41 pm

So i got to check it out today. Drained the fluid and found no metal in it which im pretty sure is a good thing. I will be tearing the transfer case out in the next couple of days. Im pretty confident that its just a chain with some slack in it. Will find out soon. Thanks for the input guys. Gotts wait untill i get a few days off to really get into it.
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lonestar rubi
Got No Life
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Number of posts : 1202
Age : 46
Location : san antionio
Rig : 2007 JK unlimited Rubicon
specs. : It's over there}
Registration date : 2010-06-21

PostSubject: Re: NP231 Problems   Sat 19 Mar 2011, 4:08 pm

I'd check the drive shafts and ring and pinion next before pulling the transfer case apart. Just .02

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3in Full Traction Premium Plus, Bilstien 5100 shocks, Bilstien 5100 steering stabilizer, 35x12.50x17 Toyo open country M/T, AEV Wheels, Lightforce 170, Rugged Ridge light bar, BesTop bikini top & duster, Superchip Programmer, Superior 5.13's and axle tube seals, Poison Spyder diff covers, Poison Spyder Built for Hammers Trail stinger, Ramsey 8000#, Dual set of Rigid Industries Dully lights, Xenon H.I.D. headlights
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SBC_Tim aka thebigtman
Got No Life
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Number of posts : 944
Age : 42
Location : La Vernia, TX
Rig : YJ/TJ, V8, tons
Registration date : 2009-09-04

PostSubject: Re: NP231 Problems   Sun 20 Mar 2011, 10:35 am

^

X2
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