tranny knocking sound while in P (park) - JeepForum.com
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post #1 of 36 Old 06-05-2021, 12:07 PM Thread Starter
Mark-318-IT
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tranny knocking sound while in P (park)

Hi guys,
i just rebuilt the tranny and i'm having this issue, video speaks for itself. when in park tranny just makes un ugly knocking sound.

is the Parking mechanism adjustable somehow?


fluid level is ok, 4 torque converter bolts are bolted correctly, starter motor is bolted correctly too.

any ideas?
EDIT: wrong, read post 6.


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post #2 of 36 Old 06-05-2021, 06:20 PM
HighLonesome
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Does the knock frequency change with engine RPM? Could be a flexplate bolt hitting something.
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post #3 of 36 Old 06-06-2021, 05:47 AM
yjsaabman
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But it goes away when a gear is engaged? Are you the torque converter was fully seated in the transmission?

I agree, it sounds more like a flex plate or torque converter bolt hitting a tweaked separator plate.

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post #4 of 36 Old 06-06-2021, 07:25 AM Thread Starter
Mark-318-IT
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it shifts perfectly, full manual is awesome.

and yes, the frequency increases with rpms.

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post #5 of 36 Old 06-07-2021, 11:22 AM Thread Starter
Mark-318-IT
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Removed the plate, but the knocking sound is the same. P cable/leverage or something P related? Is it adjustable?
http://www.youtube.com/watch?v=k6_TkdaxjX8

If I move the leverage just a bit from P to R without engaging R sound stops.

EDIT : CORRECTION, AFTER A TEST DRIVE IT'S DOING THIS ALWAYS EVERY GEAR

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post #6 of 36 Old 06-08-2021, 12:29 AM Thread Starter
Mark-318-IT
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hi guys,
recap: after yesterday's lil test drive (let's say 2 miles, to the gas station and back) tranny it's now knocking in every gear.

noise is coming from the converter area, proved this with a stethoscope.
i can not hear it in the tranny pan, nor the engine oil pan.

and yes, it's rpms related. the more rpms the higher the frequency.

torque converter bolts are fine (there is no sign of hitting something).

what am i looking for? could be a faulty converter?

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post #7 of 36 Old 06-08-2021, 03:55 AM
yjsaabman
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You absolutely should not be driving it without the full separator plate installed. Not just the little dust cover, but the full plate that goes behind the flex plate is what I am talking about. If that's not in there (people have forgotten, it's OK, we're all human) then the torque converter can be pushed into the pump too far and damage the pump. That is also what I was thinking something is hitting. It's pretty easy to tweak which can cause it to stick out.

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post #8 of 36 Old 06-08-2021, 06:36 AM Thread Starter
Mark-318-IT
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not sure what is that "full separator plate" in a 44re...got a pic or something?
google ain't helping
https://www.google.com/search?q=44re...h=758&biw=1536

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post #9 of 36 Old 06-08-2021, 10:18 AM
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It's the plate that goes behind the flex plate and between the engine block and the bellhousing. The link shows one for an XJ/AW4, but basically the same thing as the ZJ should have.

"Purchase Jeep Cherokee 4.0L Engine Automatic Transmission Spacer Plate AW4 1996-2001 in Hartville, Ohio, United States, for US $30.00" http://www.2040-parts.com/jeep-chero...2001-i2066194/

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post #10 of 36 Old 06-08-2021, 12:32 PM
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Quote:
Originally Posted by yjsaabman View Post
It's the plate that goes behind the flex plate and between the engine block and the bellhousing. The link shows one for an XJ/AW4, but basically the same thing as the ZJ should have.
Flexplate bolts directly to the crankshaft, transmission housing bolts directly to the engine block, and torque converter bolts directly to the flexplate. No separator plates on magnum engines, and IIRC the same thing with 4.0 + 42RE.

Can't really remember about the 4.0 + AW4 (which in ZJs were installed only into '92- built early MY '93s).

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #11 of 36 Old 06-08-2021, 06:03 PM
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My 94 with the 4.0L and 42re absolutely had a separator plate in it. Torque converter bolts to flex plate, flex plate to crankshaft. While the separator plate isn't that thick (1/8") it does make a difference in pump engagement in the transmission when you change that spacing by 1/8". That last engagement of the torque converter isn't much more than 3/8".

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post #12 of 36 Old 06-09-2021, 01:39 AM Thread Starter
Mark-318-IT
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Quote:
Originally Posted by Timo_90xj View Post
Flexplate bolts directly to the crankshaft, transmission housing bolts directly to the engine block, and torque converter bolts directly to the flexplate. No separator plates on magnum engines, and IIRC the same thing with 4.0 + 42RE.

Can't really remember about the 4.0 + AW4 (which in ZJs were installed only into '92- built early MY '93s).
yes, that's the setup on mine , which is why i was asking what plate i forgot.

issue remains, can't figure out where it's knocking and i'm really trying to not tear the car apart several times

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post #13 of 36 Old 06-09-2021, 03:50 AM
yjsaabman
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Makes sense the V8 doesn't have it as the block is wider so there's less air gap to fill.

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post #14 of 36 Old 06-10-2021, 10:21 AM Thread Starter
Mark-318-IT
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i'll try to put a couple of washer between the starter motor and the tranny housing next

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post #15 of 36 Old 06-10-2021, 12:22 PM
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Quote:
Originally Posted by Mark-318-IT View Post
i'll try to put a couple of washer between the starter motor and the tranny housing next
Nope, that's not how they go together.

Use OEM or OEM- quality parts only, assemble as instructed in FSM - if things don't align or work that way, you need to figure out what is wrong and fix it.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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