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- From: dhepner@cup.hp.com (Dan Hepner)
- Newsgroups: rec.autos.tech
- Subject: Re: All-Wheel Drive/4x4 Questions.
- Message-ID: <BzMoKw.JIy@cup.hp.com>
- Date: 21 Dec 92 21:19:44 GMT
- Article-I.D.: cup.BzMoKw.JIy
- References: <1992Dec20.4171.24007@dosgate>
- Sender: news@cupnews0.cup.hp.com
- Distribution: rec
- Organization: Hewlett-Packard
- Lines: 19
- X-Newsreader: Tin 1.1scd1 PL4
-
- From: "mike knox" <mike.knox@canrem.com>
-
- >All wheel drive (AWD) employs a front-to-rear differential, and so is more
- >suited to full time use. Most AWD cars and *some* of the Cherokee models
- >with "full time" 4WD use this system.
-
- Lots of 4X4s have full time 4WD. The NP203 transfer case was introduced
- during the early '70s and was used on most brands of 4X4 pickups and
- Jeep products. This was a cast iron transfer case, and developed a reputation
- for both being strong as well as needing occasional changes of its
- timing belt like drive chain. The transfer case has four positions,
- "hi loc", "hi", "lo", "lo loc". In the "loc" positions, the effect
- was exactly like having a part time case in 4WD. Newer versions are
- lighter and offer on-the-fly low-to-high range shifts, and remain
- chain driven.
-
- Full-time 4WD for cars is often offered with no "lock" potential.
-
- Dan Hepner
-