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1995 Grand Cherokee drivetrain problems

Hey everyone, hope somebody knows the answer to this one. I have a 1995 Jeep Grand Cherokee Limited with a 5.2L V8, full-time 4wd. It has an automatic with the NP249 transfer case. When I drive it, especially at

70mph or more for a mile or so, the Jeep starts making a thumping sound in the driveline and something is trying to bind up because I can hear the tires faintly screeching on the asphalt. The first time it happened, I thought I had a flat. It was that kind of sensation. I can pull to a stop, then take right back off and things are fine until my speed comes up, then all over again. I can hear it affecting my driveline, sounds like somebody pecking on my driveshaft with a small hammer. Here is what I have replaced so far:

Rear driveshaft U-joints Front driveshaft from end to end Front axles Front spider gears

None of these have helped which has led me to believe it is the transmission or transfer case. Anybody have any ideas?

Thanks, Derrick

Reply to
Hillbillyd
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Sounds like a classic VC problem in the np249.

Reply to
billy ray

Hey, not sure exactly, but try this little test. Drive it around at normal speed and let things warm up...then do this test.

Exit the roadway and make a tight turn at slow speed (best described as if you were pulling into a Mickey Dee's drive-thru sharp turns), this will make your front axles and rear axles turn at different rates; if it feels like the front is dragging across the pavement with a binding sensation, then its the VC. The VC splits the power between the front and rear drivetrains in the TC.

Do a google search on NP249 Viscous Coupler.

This is a known problem with the NP249....there are options as to replace it (VC) or swap in another model transfer case.

Hope this helps you figure it it out....I just went thru a similar situation....

T
Reply to
TM

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