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Author Topic: Where can I buy new viscous coupling for transfer case?  (Read 19708 times)

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Offline carnuck

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Re: Where can I buy new viscous coupling for transfer case?
« Reply #90 on: November 12, 2012, 04:06:04 PM »
I know when the VC goes out in a GW, they stop moving in 4x4 except in low range
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Offline captspillane

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Re: Where can I buy new viscous coupling for transfer case?
« Reply #91 on: November 12, 2012, 04:25:13 PM »
Yes, that is true. The Grand Cherokee's do not have the same transfer case. They use the NP249 until it was made obsolete by the NP247. The 249 viscous coupler is a welded assembly about 4 inches tall and 6 inches in diameter that directly connects the front input shaft to the rear output shaft. Without it present or with it burned out the car won't move.

The 229, 119, and 129 transfer cases all share a different design. The viscous coupler forms a donut around an open differential. They suck because they rely on a single O-ring to retain their fluid and they do not last as long as the 249 viscous coupler. They are awesome in the sense that once your viscous coupler fails the open differential still connects the rear output in exactly the same fashion most all wheel drive transfer cases operate.
« Last Edit: November 12, 2012, 04:27:11 PM by captspillane »
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Offline carnuck

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Re: Where can I buy new viscous coupling for transfer case?
« Reply #92 on: November 12, 2012, 05:44:03 PM »
Grand Wagoneer does NOT use NV249. You're thinking Grand Cherokee. ;^)

NP228 has just a differential inside. No VC.
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

Offline milliard431

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Re: Where can I buy new viscous coupling for transfer case?
« Reply #93 on: November 14, 2012, 07:26:49 PM »
D0 you guys recommend using synthetics in the transfer case and rear end on these older cars? I know synthetic motor oil can leak past high mileage newer engines and older rear mains. That is always a popular debate, right up there with ZDDP.

Offline BenM

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Re: Where can I buy new viscous coupling for transfer case?
« Reply #94 on: November 14, 2012, 09:10:45 PM »
I've beet putting synthetic in diffs. Mobile 75w90. It's a bit thinner when cold and should save a little power.

For the transfer case I've just used plain Dextron III, I'm worried the newer synthetic ATF being thinner could cause problems with the way it's made. ATF+4 and Dextron VI are thinner and not recommended for manual transmissions where Dextron III and prior was originally speced.

There are other options I've never investigated.
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Offline HappyPappy

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Re: Where can I buy new viscous coupling for transfer case?
« Reply #95 on: November 15, 2012, 06:47:13 AM »
  Go yo WWW.MOTORKOTE.com,  fantastic stuff, expensive, but good. Alittle goes a long way.  I used it in my SX-4 when I had it and now in my Cherokee and PT lawnmowers.  TRY IY you may like it.  Wal-Mart should have it too!!