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Old 10-12-2016, 04:46 PM
scottmcfly scottmcfly is offline
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4WD Quick Question...is it working?

When I had the front of my 89 GW up on jack stands I spun one of the front wheels, the opposite wheel would turn. But-the drive shaft did not turn. Is this the way the 4WD works? As far as I know the TC is in 4WD.

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Old 10-12-2016, 04:56 PM
joe joe is offline
 
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If you lift one axle, turn a wheel and the other wheel turns opposite. That's the way an open differential works. Has nothing to do with the transfercase.
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Old 10-13-2016, 12:30 AM
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Mike D Mike D is offline
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im confused

Lift front left and rear right .. try that again ...
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Old 11-20-2016, 04:36 PM
scottmcfly scottmcfly is offline
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Thank you for your reply. Now I understand the way an open differential works, But... should the wheels be able to spin (while in the air) and the Driveshaft not move? I just want to make sure my 4WD works.
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Old 11-20-2016, 08:55 PM
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The further up the drive line you go, the more tension will exist from various sources...
As a simple answer, with all 4 corners suspended, with an open diff, all wheels suspended, turning one wheel will simply turn the other wheel on the same axle in the opposite direction given path of least resistance...you're just spinning the axles via the spiders internal to the carrier.
Drop one wheel of the front axle to the ground, and provided your drive train is in neutral, then the grounded wheel will offer the most resistance, and turning the lifted wheel will force the ring/pinion to turn, turning the driveshaft.

None of which necessarily proves if your 4 wheel drive is actually working.
To do a test using jack stands, you'd have to have all 4 corners suspended, start it with the system engaged, and see what happens...
(Just make sure your vehicle is properly seated on the stands, and that ALL wheels are sufficiently off the ground)
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Last edited by BadRat : 11-20-2016 at 09:09 PM.
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Old 11-21-2016, 06:23 AM
JeepJeepster JeepJeepster is offline
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Ive never tried turning the driveshaft on our FSJ but, in my liberty with the 242 tcase I can turn the front driveshaft if the front wheels are off the ground and the tcase is in 2wd. When the tcase is in 4wd I cannot turn the front driveshaft with the front wheels off the ground and the rear wheels on the ground. Again, I cannot verify if this is true with the 229 but you could try it...
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Old 11-21-2016, 09:04 AM
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Marineviper Marineviper is offline
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Go find the nearest snow and gun it in reverse and see if snow flies out the front. �� But in all seriousness, Mike D's advice is the best advice as it proves the front and rear are at least integrated while transmission is in neutral.

Open differentials are not the only thing that have opposite spinning tires, trutrac posi, electric, and air lockers will to. But that isn't important in your issue.
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