When I drive around town it seems fine. But after about 15-20 min of it offroad in 4lo it starts studs wring not the engine but the fan is jumping up and down and I can feel it in the whole jeep. Feels like the tires are out of balance and I'm doing 60 but I'm doing around 5mph-10 then I put it in 4hi (247 tcase- quadratec 2 drive) and it dose the studering until I get on pavement and go about 30mph. No idea why or what it is?

2001 wj 4.7L it has hydrolic fan

 

I'm getting really sick of it and thinking its the transfer case. So thinking of swapping t-cases out for a 242 or something better any suggestions?


This is my tranny what matches??? 545RFE

 

Check your trans mount. Can cause all kinds of vibration and noise when they go bad.

 

Can do but last time I was under it looked fine I do know my u joints are going 216000 miles and never been replaced the shockes didn't get replaced until the lift went on in December let's just say the previous owner neglected it a little and the spark plugs I just did the old ones had 120000 miles on them (bosch platniums) so I'm thinking it needs some more up keep first but the juddering is defiantly in the cooling or driveline and it's only for 4lo usage or when it gets slightly above half temp

 

It was the hydrolic fan bearings replaced with electric