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Old 10-27-2017, 10:56 AM   #1 (permalink)
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LJ/TJ After market clutch suggestions

Went out for a quick trip yesterday up Holy Jim. Tow truck dropped me in the driveway 10 hours later...

Best I can tell, the clutch disintegrated . I pulled the inspection plate and starter and there are clutch pieces everywhere.

It was hot yesterday. I assume the trans got hot and destroyed the clutch.

What are you guys using for clutch replacement and trans coolers?

2005 LJ 6 speed
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Old 10-27-2017, 11:55 AM   #2 (permalink)
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Is there any chance that you coasted down a hill with the clutch engaged and then let the pedal out?
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Old 10-27-2017, 12:07 PM   #3 (permalink)
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I tried the Luk replacement clutch. Was not happy. The 6 speeds use a Sachs clutch from the factory. I went back to factory and it was worlds better. I also advise against turning the flywheel.
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Old 10-27-2017, 12:30 PM   #4 (permalink)
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I tried the Luk replacement clutch. Was not happy. The 6 speeds use a Sachs clutch from the factory. I went back to factory and it was worlds better. I also advise against turning the flywheel.
I put a centerforce in my 98. The FSM specifically says not to turn flywheel.
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Old 10-27-2017, 01:40 PM   #5 (permalink)
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A manual should never get hot enough to destroy a clutch. A clutch only gets hot when it's slipping.
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Old 10-27-2017, 02:12 PM   #6 (permalink)
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Is there any chance that you coasted down a hill with the clutch engaged and then let the pedal out?
I don't remember exactly when it happened. I doubt I did that since I was in 4 lo and first gear. I was going down hill. I suppose I could have done that. Why, what did I break?
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Old 10-27-2017, 02:41 PM   #7 (permalink)
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I come from a toyota background. With the introduction of dual cases, compound and much lower crawl ratios, people began to explode clutches. It's a speed differential problem, the engine is idling at 500 rpm and the trans input could be spinning at 10,000 rpm.

Making some assumptions and using the vehicle speed calculator on marlincrawler.com, a tj rubicon in 1st gear, low range and with 35" tires and stock axle gearing, would be spinning the trans input at 10,000 rpm at 14mph.

Last edited by Wilson; 10-27-2017 at 02:53 PM.
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Old 10-27-2017, 03:02 PM   #8 (permalink)
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I come from a toyota background. With the introduction of dual cases, compound and much lower crawl ratios, people began to explode clutches. It's a speed differential problem, the engine is idling at 500 rpm and the trans input could be spinning at 10,000 rpm.

Making some assumptions and using the vehicle speed calculator on marlincrawler.com, a tj rubicon in 1st gear, low range and with 35" tires and stock axle gearing, would be spinning the trans input at 10,000 rpm at 14mph.
The more I think about it, the more I believe you are correct. Again, I don't know why I would have done that given how I normally drive but, entirely possible. The strange part of the equation is the Jeep will start and run (fortunately because that's how I winched out) but, will not go into any gear. I assumed the heat caused the throw out bearing to stick??? Thanks for the input, I will tear into this weekend.
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Old 10-27-2017, 03:09 PM   #9 (permalink)
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I tried the Luk replacement clutch. Was not happy. The 6 speeds use a Sachs clutch from the factory. I went back to factory and it was worlds better. I also advise against turning the flywheel.
Good info. Thanks for the heads up
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Old 11-11-2017, 07:55 AM   #10 (permalink)
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Originally Posted by Wilson View Post
I come from a toyota background. With the introduction of dual cases, compound and much lower crawl ratios, people began to explode clutches. It's a speed differential problem, the engine is idling at 500 rpm and the trans input could be spinning at 10,000 rpm.

Making some assumptions and using the vehicle speed calculator on marlincrawler.com, a tj rubicon in 1st gear, low range and with 35" tires and stock axle gearing, would be spinning the trans input at 10,000 rpm at 14mph.
Wilson was correct. The clutch exploded! Not a single piece attached to the rivets. Thanks for the advice.
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Old 11-11-2017, 09:28 AM   #11 (permalink)
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I had a luk clutch installed about 300 miles before i tore my jeep down. I was never happy with it either and can't offer anything specific, just that it was not the same. I'll probably swap it out for a sachs before it goes back on the trail.
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Old 11-11-2017, 01:50 PM   #12 (permalink)
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I got a Sachs off Amazon for $50 less than the brand O'reilly offers.
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