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Part Time or Full Time 4X4... What's the difference?


 
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Tim Hallam
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Joined: 06 Dec 2007
Location: Mt. Shasta, California

PostPosted: Mon Jun 23, 2008 11:31 pm    Post subject: Part Time or Full Time 4X4... What's the difference? Reply with quote

I was just wondering what the difference between part time four wheel drive and full time is?

Why is it ok to drive in full time 4X4 on any terrain including pavement but not reccomended to drive in part time 4X4 on hard surfaces such as pavement?

I'm just wondering what the mechanical difference is between the two selections.

Thanks -

Tim
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Tue Jun 24, 2008 12:26 am    Post subject: Re: Part Time or Full Time 4X4... What's the difference? Reply with quote

Tim Hallam wrote:
I was just wondering what the difference between part time four wheel drive and full time is?

Why is it ok to drive in full time 4X4 on any terrain including pavement but not reccomended to drive in part time 4X4 on hard surfaces such as pavement?

I'm just wondering what the mechanical difference is between the two selections.

Thanks -

Tim


This is something I found about this very topic a while ago that explains the differences...

Quote:

When the part-time four-wheel drive system is engaged, both front and rear driveshafts are locked by a chain and gearset and always turn at the same speed forming a single driving unit. This is a rigid connection that does not allow for any differential action between the front and rear axles. Normal front-to-rear differences in the turning radii of the tires are only compensated for through wheel slippage over adverse driving surfaces.

With the fulltime case, four-wheel drive can be utilized for all driving conditions. A planetary differential between the front and rear axles allows them to turn at different speeds as when cornering while dividing torque equally between them.

Essentially, the part-time system offers better gas mileage but requires shifting into 4-wheel drive when needed. The full-time system is always on and can be applied to all conditions. The full-time system has a position where the differential can be locked, in 4H and 4L, for the ultimate in 4-wheel drive. This gives you the convenience of 4-wheel drive at all times and the ability to lock the center differential for adverse conditions.


Hope this helps. Mr. Green
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Tim Hallam
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Joined: 06 Dec 2007
Location: Mt. Shasta, California

PostPosted: Fri Jun 27, 2008 12:29 pm    Post subject: Reply with quote

Hmm....

Thank you.

Tim
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The true measure of a Jeep is not where it can go, but rather, where it has been.

1986 Pioneer, 1990 Laredo, 1991 Sport, 1993 Sport & 1998 Sport.
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