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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > To flush or not to flush, that is the question.

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Unread 02-22-2008, 04:42 PM   #1
JBN311
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To flush or not to flush, that is the question.

1. I'm changing the trans fluid and I have been searching the forum to find out if a trans flush is needed, I can't seem to find a clear cut answer.

It just passed 60,000.

2. Also, the FSM looks kind of complicated when looking at the diagrams. When I break into it, will it be more obvious where the filter seats etc???
I have never dealt with the trans. Can I just get a filter change kit or something?

Thanks.

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2004 WJ Laredo V8, NP242 swapped in, front Dana 30 w/ Vari-Lok, Aussie Locked 44a, BB, 30" BFG A/T's, Tow hooks, Rear Hitch, CB, Better than stock radio/MP3 player.
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Unread 02-22-2008, 05:11 PM   #2
Windowsrookie
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Just change the fluid in the pan. I'm not a fan of flushing.
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Unread 02-22-2008, 05:29 PM   #3
JBN311
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What about the filter?
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-Jesse

2004 WJ Laredo V8, NP242 swapped in, front Dana 30 w/ Vari-Lok, Aussie Locked 44a, BB, 30" BFG A/T's, Tow hooks, Rear Hitch, CB, Better than stock radio/MP3 player.
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Unread 02-22-2008, 05:33 PM   #4
CLASH
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I would use a quality filter and just refill the pan.
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Unread 02-22-2008, 05:35 PM   #5
CMARJEEP
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60k is one of the big maintenance schedules. it includes changing almost everything, including the tranny. i agree though just to refill the pan, change the filter, then get new gaskets. check out wjjeeps.com for what you should be changing and doing at 60k...
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Unread 02-22-2008, 06:01 PM   #6
manofmany
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Drain and Refill ONLY

Do not let anyone convince you that flushing your transmission is good. It's not.
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Unread 02-22-2008, 06:04 PM   #7
sandman
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well if theres a turd flush, aka if the fluid looks like crap flush it,
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Unread 02-22-2008, 07:01 PM   #8
CrazyWalnut13
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Quote:
Originally Posted by sandman View Post
well if theres a turd flush, aka if the fluid looks like crap flush it,
Correct

"If it's brown, flush it down; if it's yellow, leave it mellow"
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Unread 02-22-2008, 07:10 PM   #9
RJV
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Quote:
Originally Posted by manofmany View Post
Drain and Refill ONLY

Do not let anyone convince you that flushing your transmission is good. It's not.
why do you think that? If the fluid is dark that is the only way to get all of the fluid out and replace it with new fluid. the only time i would steer away from a flush is if it is a high mileage vehicle that has never been maintained.
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Unread 02-22-2008, 07:15 PM   #10
Chief Slacker
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Quote:
Originally Posted by manofmany View Post
Drain and Refill ONLY

Do not let anyone convince you that flushing your transmission is good. It's not.
This info is incorrect for a vehicle w/ only 60k on it.

Quote:
Originally Posted by RJV View Post
why do you think that? If the fluid is dark that is the only way to get all of the fluid out and replace it with new fluid. the only time i would steer away from a flush is if it is a high mileage vehicle that has never been maintained.
EXACTLY Correct!!!!

By simply dropping the pan......you are not getting the fluid out of the lines,converter,cooler,etc. A vehicle with only 60,000 miles on it should most definitely get a complete flush!
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Unread 02-22-2008, 07:22 PM   #11
Windowsrookie
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Do what you want, but I would never flush a transmission. If you want to get all of the fluid out disconnect one of the hoses and let the transmission pump the fluid out itself.
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Unread 02-22-2008, 07:23 PM   #12
Turbonut
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Quote:
Originally Posted by RJV View Post
why do you think that? If the fluid is dark that is the only way to get all of the fluid out and replace it with new fluid. the only time i would steer away from a flush is if it is a high mileage vehicle that has never been maintained.
Chrysler fluid will turn dark over the time and is not an indication of a problem, it's normal. The fluid is actually 100,000 mile fluid under normal driving condititons.
Change both filters, the flat and spin on, and make certain it's the updated design. The flat filter needs to have the seal pryed from the trans body , then the new one installed into the body before installing the filter. I put a wooden hammer handle against the seal, then hit that hammer head to drive the seal in.
As stated above, take a look a wjjeeps.com.
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Unread 02-22-2008, 07:38 PM   #13
CLASH
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on zj 42re they only have 1 filter right?
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Unread 02-23-2008, 07:12 AM   #14
greasefingers
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Yes there is only one filter and you need a T25 wrench to remove the three filter bolts.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 02-23-2008, 07:15 AM   #15
greasefingers
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To flush a perfectly fine operating tranz is only asking for trouble. Remove the pan and replace the filter and then fill thru the tranz dip stick. If you are worried about replacing most of the fluid, then replace the fluid twice over two weekends.
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94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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