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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'98 Jeep Grand Cherokee

Q: Why does my ’98 Jeep Grand Cherokee have all four wheels engaged on dry pavement? It just started doing this and seems to be ok on the road. When turning into a parking space or any short turns you can tell it is in 4-wheel drive.

- Earl F.

A: It is likely that your Jeep has a model NV249 transfer case (circular I. D. tag can be found at the rear of the transfer case). In your vehicle’s 4 wheel drive is full time ready but is rear wheel drive most of the time. Most of the available engine torque/power is directed to the rear wheels during normal driving. When the weather becomes a challenge a device in the transfer case called a viscous coupler will direct the engine power to the front wheels as well. The transition from 2 to 4 and back to 2 wheel drive is seamless unless the viscous coupler is starting to fail. When a viscous coupler starts to fail they seem to like to lock into the 4-wheel drive mode and stay there. The fix requires a replacement viscous coupler. In most cases this can be replaced without even removing the transfer case from the vehicle. A word of caution, if the viscous coupler is failing it needs to be replaced. Even though your vehicle is a 4-wheel type vehicle is it not meant to be operated in 4-wheel drive all the time. If driven too long in 4wd, damage to the drive train of the vehicle can occur.

 
     
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