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Part identification help.

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Old 05-14-2010, 08:17 AM
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Default Part identification help.

What is the part that is behing my oil drain plug. There is a plate and i can see inside and there seems to be gears and the plate is cracked bad. I have a 4.0 and my tranny is a np231.
Old 05-14-2010, 08:36 AM
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Sounds like the Flywheel to me. Is it making noise when it runs? BTW if its an automatic the trans is a AW4, the NP231 is the transfer case for the 4 wheel Dr...Tj
Old 05-14-2010, 08:42 AM
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It's FlexPlate, not a flywheel. Yes there is a huge difference.

Cracked flrxplates are not uncommon.

I've got a spare that will work with your engine, $50 shipped.

No, you cannot install just any flexplate from any year 4.0L.
Old 05-14-2010, 08:48 AM
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I want to say thats the torque converter that sits just before the tranny in the bell housing. The plate you talk of is a 1/3 plate that covers the part of the tranny/torque converter thats not covered by the engine.

If its vibrating, try tightening the bolts that hold the plate in place.



This is not an AW4, just an image to show what I mean. You will not have the "Bell Housing Brace" But the rest is close to what you have.
Old 05-14-2010, 08:54 AM
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Originally Posted by FrankZ
It's FlexPlate, not a flywheel. Yes there is a huge difference.

Cracked flrxplates are not uncommon.

I've got a spare that will work with your engine, $50 shipped.

No, you cannot install just any flexplate from any year 4.0L.
Hmm my bad ...Tj
Old 05-14-2010, 08:54 AM
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No, you're incorrect. The torque converter is bolted to the back side of the flexplate and is not visible by removing the inspection cover.
Engine-->Flexplate-->Torque Converter-->Transmission-->Transfercase.
Old 05-14-2010, 08:57 AM
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So the giant gear thing behind the plate is the flex plate?
Old 05-14-2010, 09:06 AM
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I call that an excess panel. But whatever you call it its not that big of a deal untill you wheel it a lot of older GMs don't even have one (cars). Any way you can take it off untill you have cash for a new one or just leave it be. Junk yards will have them or order one from whoever that was that had a few spars. I just wanted to say its not a big deal.
Old 05-14-2010, 09:20 AM
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Originally Posted by havensov
So the giant gear thing behind the plate is the flex plate?
Nope, flywheel. Thats where your starter makes contact and turn the motor over.
Old 05-14-2010, 09:27 AM
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Originally Posted by brutalxj
I call that an excess panel. But whatever you call it its not that big of a deal untill you wheel it a lot of older GMs don't even have one (cars). Any way you can take it off untill you have cash for a new one or just leave it be. Junk yards will have them or order one from whoever that was that had a few spars. I just wanted to say its not a big deal.
If you go without one and get crap and rocks jammed in there it will be a big deal. IMO
Old 05-14-2010, 09:34 AM
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See you learn something new everyday...

When I got my new XJ, that panel was missing. Just grabbed the one off my other parts XJ.
Old 05-14-2010, 09:43 AM
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Originally Posted by Quazzimoto
Nope, flywheel. Thats where your starter makes contact and turn the motor over.
No, you are wrong. Manual transmissions have a flywheel, automatic trannys have a flexplate.

Apples and oranges.
Old 05-14-2010, 10:06 AM
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Default Still need help

This isnt my picture but mine is cracked open where the white arrows are pointing at. Is that the flexplate and whats behind it.
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Old 05-14-2010, 10:15 AM
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That's the inspection cover, and the flex-plate is behind that.
Old 05-14-2010, 10:15 AM
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That's just the inspection cover. $5 at the junkyard.


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