Front Wheels Are Free To Rotate - Hyundai Forums : Hyundai Forum
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#1 Old 06-02-2011, 08:12 AM
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Recently I was doing an oil change...had the front of the car jacked up and noticed something weird...I was able to rotate the front wheels with my hands with relatively minimal force...the transmission was in Park...the Sonata is a FWD car so the front wheels should be connected to the transmission and should be locked if the transmission is in Park...otherwise the car could potentially roll on an incline or decline if the parking brakes are not engaged...has anyone noticed this issue???
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#2 Old 06-02-2011, 08:37 AM
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QUOTE (S_O_N_A_T_A @ Jun 2 2011, 07:12 AM)
Quote:
Recently I was doing an oil change...had the front of the car jacked up and noticed something weird...I was able to rotate the front wheels with my hands with relatively minimal force...the transmission was in Park...the Sonata is a FWD car so the front wheels should be connected to the transmission and should be locked if the transmission is in Park...otherwise the car could potentially roll on an incline or decline if the parking brakes are not engaged...has anyone noticed this issue???
When you turned the one front wheel, did the other turn in the opposite direction? If that is the case it is normal since the differential is not locked when the transmission is in parked , only the transmission.

You will see the same thing happening on the rear wheels of a rear wheel drive car when in park
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#3 Old 06-02-2011, 10:17 AM
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QUOTE (RamKat @ Jun 2 2011, 07:37 AM)
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When you turned the one front wheel, did the other turn in the opposite direction? If that is the case it is normal since the differential is not locked when the transmission is in parked , only the transmission.

You will see the same thing happening on the rear wheels of a rear wheel drive car when in park

Nope, both wheels are turning in the same direction...
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#4 Old 06-02-2011, 11:13 AM
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QUOTE (S_O_N_A_T_A @ Jun 2 2011, 09:17 AM)
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Nope, both wheels are turning in the same direction...
Are you really sure?? They should turn in opposite directions due to the differential gears.
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#5 Old 06-02-2011, 11:18 AM
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Test it out; put your tranny in park on a shallow incline/decline (driveway?) without the parking brake engaged and slowly lift your foot from the brake (otherwise the car may lurch)... If the car rolls without resistance, you have a pretty serious issue...

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#6 Old 06-02-2011, 12:04 PM
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hmm...now I'm not sure...I guess I'll check again this weekend...
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#7 Old 06-02-2011, 05:05 PM
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If you really had it in park, I'd be willing to bet that the wheels were turning in opposite directions. It's perfectly normal for them to do so.
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#8 Old 06-02-2011, 05:57 PM
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QUOTE (11yfLtd @ Jun 2 2011, 03:05 PM)
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If you really had it in park, I'd be willing to bet that the wheels were turning in opposite directions. It's perfectly normal for them to do so.


Something is not right ....... If the transmission is in park the front wheels should not move ... If the transmission is in neutral they would move in the opposite direction
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#9 Old 06-02-2011, 07:07 PM
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QUOTE (Xsolara @ Jun 2 2011, 04:57 PM)
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Something is not right ....... If the transmission is in park the front wheels should not move ... If the transmission is in neutral they would move in the opposite direction
Both drive-shafts are connected to the transmission via the differential. The differential is made up of carrier gears (located at the end of the drive-shafts), ring gear (driven by the transmission) and a carrier gear (this links the ring gear to the carrier gears). The ring gear would be locked by the transmission (if not in neutral) but with both wheels off the ground, the wheels will turn in opposite directions due to the make-up of the mentioned gears. If one wheel was on the ground (or unable to turn) then it would be impossible or difficult (depends on the type of differential) to turn the free wheel.
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#10 Old 06-02-2011, 09:31 PM
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Here's a good video on how differentials work, this further explains why they spin in opposite directions.

http://www.youtube.com/watch?v=yYAw79386WI
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