Recent Topics
'91 Mazda B2600i transfer case and trans oil?
by Jason280
46 minutes 9 seconds ago
How to cut power to breaker box ?
by Merkava_4
Today at 02:21 AM
Spark plugs in hi-per applications
by mjoekingz28
Today at 01:07 AM
OK, before I lube it ...
by BrocLuno
Today at 12:53 AM
Toyota Japan Fluid SDS
by SXE10
Yesterday at 11:28 PM
Online Oil Viscosity Selectors
by Merkava_4
Yesterday at 11:25 PM
Considering a differential swap
by buck91
Yesterday at 10:18 PM
HVAC Evaporator Cleaning Results
by sleddriver
Yesterday at 09:51 PM
Car Acronyms
by Marco620
Yesterday at 09:46 PM
Vibration with new tires - your thoughts
by Bandito440
Yesterday at 09:41 PM
Carpet cleaning methods.
by Run
Yesterday at 09:26 PM
Fram XG16 4522mi 5.7 Hemi
by AntsinmyEyes
Yesterday at 09:26 PM
Newest Members
peg, CornbreadMan, JoelB, alostaunau, alanwayne1908
58295 Registered Users
Who's Online
31 registered (Char Baby, Atesz792, b1amgm47, 1foxracing, crainholio, 4 invisible), 732 Guests and 13 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58295 Members
66 Forums
250918 Topics
4112662 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#3444380 - 08/03/14 01:09 AM Dodge Nitro 4x4 big problem with 4WD lock!!
19jacobob93 Offline


Registered: 02/12/14
Posts: 686
Loc: Gold Coast, QL, Australia
Just went for a ride with my old man in his 2008 Nitro (same vehicle as the last Jeep Cherokee)
He stuck it in 4WD mode because he hasn't done so before and wanted to blow out the cobwebs as some 4wd systems are prone to siezing if unused
It wouldn't engage properly and made a loud whurring sound when driving coupled with a serious knocking/thudding sound when we went round a corner and the car wouldnt steer more than quarter lock! Also the car vibrated like crazy when in park or neutral.
We put it back in 2wd and it still wouldnt steer at first but after 5-10 seconds of driving it started working fine again.
This problem is only with the 4wd mode so what could it be? Is it a common problem because i cant find much doing searches online
_________________________
Car: 2000 Ford Falcon AU2 - 4.0L SOHC I6 @247,000km
Oil: Valvoline Engine Armour 10W30 + LM MoS2 (7.5k OCI)
Fuel: 95 unleaded + TCW3

Top
#3444382 - 08/03/14 01:19 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: 19jacobob93]
bvance554 Offline


Registered: 09/24/12
Posts: 1747
Loc: VA
What type of surface were you on? Pavement?

Top
#3444388 - 08/03/14 01:50 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: bvance554]
Chris142 Offline


Registered: 06/05/03
Posts: 13891
Loc: apple valley, ca
Originally Posted By: bvance554
What type of surface were you on? Pavement?
x2. not ment to be engaged on hard surfaces ....ever!
_________________________
02 Wrangler super-s 10w30
87 F250 delo 15w40
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Can am maveric delo 5w40

Top
#3444393 - 08/03/14 02:47 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: bvance554]
19jacobob93 Offline


Registered: 02/12/14
Posts: 686
Loc: Gold Coast, QL, Australia
1st time we tried it was on grass, tried it again on the tarmac after and same both times. Seems like the surface wouldnt be the problem, more the 4wd system is screwed. Had other 4x4s for years doing the same thing at the same place without a problem
_________________________
Car: 2000 Ford Falcon AU2 - 4.0L SOHC I6 @247,000km
Oil: Valvoline Engine Armour 10W30 + LM MoS2 (7.5k OCI)
Fuel: 95 unleaded + TCW3

Top
#3444408 - 08/03/14 05:01 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: Chris142]
Oil Changer Offline


Registered: 08/28/06
Posts: 2297
Loc: Michigan
Really? So I have to stop using four wheel drive during my winter commuting?

Originally Posted By: Chris142
Originally Posted By: bvance554
What type of surface were you on? Pavement?
x2. not ment to be engaged on hard surfaces ....ever!

Top
#3444421 - 08/03/14 05:59 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: 19jacobob93]
Shannow Online   content


Registered: 12/12/02
Posts: 33153
Loc: Oz
With the centre locked, the front and rear driveshafts are locked together. which means that the front and rear ring gears MUST turn at exactly the same time. Problem is that the tyres are all different diameters, and as you turn corners, they all turn at different speeds.

This "winds" up the drivetrain components to the limit of traction, which means that the torque on each axle, universal, clutch etc. is exactly the same as if each of the 4 wheels was doing a "burnout" (more actually, as the tyres are probably at low levels of slip, not spinning.

That's why everything feels tight...and why often, you have to back back a few metres to unwind it all before you can unlock.

The big problem is that if you do that at speed, the torque times the RPM mean that you have a thing called "circulating power"...the apparent power through the ground/tyres/diffs can be many many times that which the engine puts out (it can't pull a 4 wheel burnout, but that's the sort of power running through the drivetrain). The engine only has to provide enough power for the speed, and the frictional losses in the drivetrain...

it can and does burn out diffs, fatigue axles and CV/Universals.

If it's on gravel, snow, sand etc., then the limit of traction is very low, and the circulating power low, and that's when they are designed to be used.

Dry pavement and locked centre 4WD is a recipe for broken parts.

Top
#3444510 - 08/03/14 08:32 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: Oil Changer]
Chris142 Offline


Registered: 06/05/03
Posts: 13891
Loc: apple valley, ca
Originally Posted By: Oil Changer
Really? So I have to stop using four wheel drive during my winter commuting?

Originally Posted By: Chris142
Originally Posted By: bvance554
What type of surface were you on? Pavement?
x2. not ment to be engaged on hard surfaces ....ever!
if your winter commute consists of pavement or hard packed dirt...yes.
_________________________
02 Wrangler super-s 10w30
87 F250 delo 15w40
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Can am maveric delo 5w40

Top