On highway, clunk in driveshaft and won't shift or pass 60mph - JeepForum.com
 
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post #1 of 4 Old 02-14-2020, 04:43 PM Thread Starter
ClownInAJeep
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On highway, clunk in driveshaft and won't shift or pass 60mph

Hi all. I'm gonna try starting a new build thread later today. But thought I could put up specific problems that could relate to everyone here. This is what I'm driving:

2000 WJ 4.7 Quadra-Trac with 247 with approximately 190,000 miles

So I'm not sure if it's the transmission, rear driveshaft, throttle position sensor, pcm, transfer case, or rear differential. But the 2 main problems is:
1) When shifting from park and back and forth, most times there is a large clunk or jolt to get it in gear.
2)Driving down there highway as I pass 50mph but before 60mph, I will sometimes get a loud clunk and jolt in the rear (sounds like from driveshaft), trans sounds like it drops down a gear, and then stays in that gear hovering around 2,200rpm. And it won't go past 60mph. If I try, it starts to stutter as if about you stall.

I feel like I've read many similar types of threads on this sort of thing. But I'm horrible at assimilating all that info to accurately diagnose my troubles.

Much thanks for any tips.

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post #2 of 4 Old 02-15-2020, 11:21 AM
Bigrigr
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Two things jump out at me here....I think you have separate problems.

First, double check your exhaust system for a blockage. It sounds as though your engine is struggling to expel the exhaust out, and its smothering the engine. Most likely a plugged up Catalytic converter somewhere. this would be the cause of the struggling to get above 60 MPH.

Second, double check your engine and transmission mounts. One on either side of the engine down low(easily seen from underneath the front of Jeep), and one in the middle directly underneath the adapter between the transmission and transfer case(basically between the front seats underneath the Jeep). Sounds like one or more of them is shot, and letting the engine/trans/transfer case move around.

'00LMTD-4.7l,242hd,D30,D44A,3.73's,True-trac front,Spartan rear,3"BBfront,2"BBrear,JK'sW/32's
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post #3 of 4 Old 02-20-2020, 06:12 AM Thread Starter
ClownInAJeep
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Thanks so much for the tips! I pulled off the cat and put on another from the parts jeep. The engine stumbling has appeared to be taken care of so far. Although I have to admit I'm not so sure on what to be looking for with the mounts. But i'm thinking i might as well replace them if I can find some decently priced.
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post #4 of 4 Old 02-22-2020, 12:56 AM
Bigrigr
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The Engine mounts are on either side of the engine down low and just forward of center on the engine. They are easy to see from underneath the front of the Jeep.



If you get a helper,and your park brake works well, you can check your mounts by putting on the parking brake tight. Next hold your foot on the brake, and using the other foot, rev the engine slightly. With some one outside looking under the hood, if the engine mounts are loose or broken, the engine itself will try to jump out of the engine bay. Usually you see the drivers side jump up when you bring the rpms up, and then it will fall back down when you let off the gas. Same process for the trans mount, except you have to have your helper watching under the Jeep at the crossmember. There should be a little bit of movement in all of the mounts, but if they move alot, then thats not good. The clunk would be the engine/trans moving excessively, and then crashing back down when you let off.


190,000 miles is alot of miles on ANY rubber mount. They probably all need replaced anyway.

'00LMTD-4.7l,242hd,D30,D44A,3.73's,True-trac front,Spartan rear,3"BBfront,2"BBrear,JK'sW/32's
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