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Old 04-19-2008, 03:35 PM   #1
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which flywheel........

Hi people, I got a little problem with my little pride. First to introduce my self here, I am kind of new to wrangler world bit I got hooked on it . So I bought a 2003 TJ SE 2.4 5-speed. But ever since I bought it the shifting was not so smooth (like grinding when shifting from first to second or second to third gear) and my first reaction was that the clutch was bad. And now I decide to put a new clutch in. So after taking it all apart and puting new clutch kit in and everything back toagether, the problem remains the same if not wors (sorry for my spelling). While everything was apart I've also taken the flywheel off and noticed that so called "flexplate" that sits on flywheel, moves freely on flywheel back and forth about half inch or more. And the "flexplate is not as tight to the flywheel as I think it should be, it kind a has that play back and forth up and down if u know what I mean. So my question is should I replace the flywheel or what? A I just came back from dealer and they only list a regular flywheel and not the one my TJ uses which is the one (flywheel and flexplate toagether). And they could not even tell me if the flywheel they list is the upgrade for mine or anything. Please help....

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Old 04-19-2008, 03:37 PM   #2
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flywheel= manual
flexplate= auto

Are you talking about the starter ring gear?

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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 04-19-2008, 03:43 PM   #3
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Did you check the tranny fluid level? Also it's common for the sycros to wear out on the ax5 and cause hard shifting. Even more so if the wrong fluid is used.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 04-19-2008, 05:35 PM   #4
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tranny fluid level is good. so you are saying that there is no flexplate on flywheel on manual transmision!!! I'am talking about flywheel that presure plate is attached(scrued) to, and the clutch disk sits between them.
Here is a picture of my TJ, cant wait for warmer weather to take the top off, after I fix it....
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Old 04-19-2008, 05:42 PM   #5
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nice jeep.

Here is a fly wheel with the presure plate and clutch.


This is a flexplate that is on a auto and connects to the tourque converter.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 04-19-2008, 05:58 PM   #6
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Ok, thanks alot. I guess I gonna have to go with a new flywheel which is $417 in dealer, unless somebody now cheaper place, I already checked carquest, napa, autozone nobody can get it...
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Old 04-19-2008, 06:31 PM   #7
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I wonder if any one makes a lightweight flywheel for wranglers.
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Old 04-19-2008, 06:50 PM   #8
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I've never seen one for the 4.0 or 2.5
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 04-19-2008, 07:02 PM   #9
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It will be very good option for our heavy rpm unfriendly engines.
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Old 04-19-2008, 07:11 PM   #10
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I wonder if any one makes a lightweight flywheel for wranglers.
An extra heavy flywheel is what most people want, especially for the four-banger. Called an enertial flywheel, its added weight makes the engine run smoother and less likely to stall out on slow-speed offroad condtions.
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Old 04-19-2008, 07:29 PM   #11
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An extra heavy flywheel is what most people want, especially for the four-banger. Called an enertial flywheel, its added weight makes the engine run smoother and less likely to stall out on slow-speed offroad condtions.
really, i was just asking myself the same thing today, as i tore down the old 4.2 motor for scrap. but we really don't want a lightweight flywheel huh? what about in a jeep stroker?
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Old 04-19-2008, 08:25 PM   #12
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really, i was just asking myself the same thing today, as i tore down the old 4.2 motor for scrap. but we really don't want a lightweight flywheel huh? what about in a jeep stroker?
Sorry but I have no idea what kind of flywheel works best for strokers. But I'd imagine a light flywheel would be good for racing where you want fast RPM changes, but for my low-speed rock crawling, I think I'd want a heavier flywheel to keep the engine going in low RPM trail situations where it wants to stall.
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Old 04-19-2008, 09:32 PM   #13
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well lighter flywheel will make the engine idle rougher however it will rev much faster. For rock crawling with an automatic transmission you will get much "crispier" response when you step on the gas and much more control of the engine when you step on the gas. Since the engine has less inertia it will also help out with mpg, shifts during city driving and at last free up some power.
It will be a bit tougher on the Manual Trannies since you will have to depend on the gas to keep you moving as the engine will be easier to stall (like Jerry noted above) however the engine will rev friendlier.

A buddy of mine just installed a light flywheel on his TC and now it pulls much more. You can easily notice the difference. The shifts are not as hard however it pulls much harder throughout the entire rpm range. It idles a bit harder but after all its a 4 banger.
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Old 04-19-2008, 09:35 PM   #14
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I was just reading on a jeep stroker forum that light wait flywheels will allow it to rev up quick but thats not what the 4,0 is made for with it's long stroke. The heavy fly wheel helps keep the engien running when crawling at low speeds. So a light flywheel for a 4.0 is just dumb. It's not a drag motor.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 04-19-2008, 09:44 PM   #15
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ya, the stroker is huge on low end torque, i'm glad we hit this, now i know i don't even need to look for a flywheel.
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Old 04-20-2008, 12:39 AM   #16
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lighter flywheel frees up some low end torquees too since the motor has to turn less weight..

In a 2 cylinder i understand but a 6 cylinder has 3 power strokes per revolution....
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Old 04-20-2008, 01:38 AM   #17
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ok im lost on what the origonal poster is actually asking, what is moving a half inch?
your clutch disk can move a little, it has springs on it for that purpose. do you mean the little pilot bearing in the crankshaft?
nothing can really go wrong with a flywheel other than cracking it or overheating it by riding the clutch.
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Old 04-24-2008, 11:13 PM   #18
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OK here is the picture of the new one I got for $312. I was talking about that plate that sits on top of flywheel that makes i guess makes shifting smoother. And yes that thing is heavy....
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