Trans fluid - to change or not to change? - JeepForum.com
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post #1 of 22 Old 01-06-2010, 06:03 AM Thread Starter
pzappa
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Trans fluid - to change or not to change?

My jeep is at 130,000 without a transmission fluid change/flush... I am currently replacing the radiator and noticed the trans fluid from the trans cooler lines is very dark brown.

I have read that a fluid change/flush can do more harm than good in neglected trannys. Is this the case? Would a change with no flush be a better idea?

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post #2 of 22 Old 01-06-2010, 06:14 AM
bigbill888
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If it was mine, I would change fluid/filter with no flush.

96 ZJ Laredo, 4.0, 242, 230K
95 ZJ Limited, 4.0, 242, 140K
98 XJ Sport, 4.0, 231, 140K
All work well
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post #3 of 22 Old 01-06-2010, 06:34 AM
sandman
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yea, just drain the pan and fill. i wouldnt do a flush unless your slipping now.

1993 Jeep ZJ. 4.0
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post #4 of 22 Old 01-06-2010, 06:56 AM
Turbonut
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Depending on the trans, drain and change the filter or filters and refill. You'll experience no problems.
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post #5 of 22 Old 01-06-2010, 06:58 AM
Max78
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Yes change your fluid. Allot of people underestimate the importance of trans fluid. My trans was acting funny and I thought at 100K I better change the trans fluid filters and it fixed my problems. Now I think I need to get the bands adjusted.

92 Cherokee - All nude and in need of some tlc!
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post #6 of 22 Old 01-06-2010, 07:02 AM
ratmonkey
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the 545rfe doesn't experience the issues that older trannies did when they were flushed after a long period of time.

a flush or a pan drop and filter change will do no harm to that particular unit.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #7 of 22 Old 01-06-2010, 11:35 AM
W3MOT
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A transmission fluid change is good if it's done regularly. (I've heard about every 30k. But if you were to change in out of nowhere then it could do some damage. Im no mechanic but just going by what I've heard.
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post #8 of 22 Old 01-06-2010, 01:08 PM
txtumbleweed
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Remember that most "flushes" or "fluid replacements" don't include a change of the filters. At 130K, a filter change (both filters if you have the 4.7 545RFE tranny) is clearly in order for your WJ.

Y2K WJ 4.7
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post #9 of 22 Old 01-07-2010, 12:35 AM
ratmonkey
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Quote:
Originally Posted by W3MOT View Post
A transmission fluid change is good if it's done regularly. (I've heard about every 30k. But if you were to change in out of nowhere then it could do some damage. Im no mechanic but just going by what I've heard.
This is why proper maintenance hardly ever happens to trannies.

Old heads preaching about what a fluid flush did to their old c4 or powerglide..

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #10 of 22 Old 01-07-2010, 07:06 AM Thread Starter
pzappa
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Thanks

Thanks for all the info.. I'll drop the pan, replace filters, and refill.
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post #11 of 22 Old 01-07-2010, 02:45 PM
bg00gt
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have fun i took my tranny bath last week.While you have it up in the air you might want to check the transfercase too
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post #12 of 22 Old 01-07-2010, 05:05 PM
comptiger5000
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I'd change the fluid and filters (no need to do a full flush). If the fluid still looks nasty in a few hundred miles, change it again.
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post #13 of 22 Old 01-07-2010, 06:01 PM
02Lightning
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I think there is 3 different ways to change the fluid in your trans. Drain it by pulling the pan (doesn’t get it all out), power flush (an external pump is hooked up and pushes the fluid out). And the last, disconnect one of the trans lines and hook it up to a reservoir and the car pumps out the old fluid as it is pumping in the new fluid. The reason people run into problems flushing out old fluid is because they have them power flushed and it pushes dirt through your trans. The last method is the best because it gets all the old fluid out, by using the cars pump to pump out the fluid, not putting the fluid under excessive pressure causing dirt to break loose.

1995 Jeep Grand Cherokee Limited 4.0L NP249 Transfer Case, 42RE, 212,000 miles
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post #14 of 22 Old 01-07-2010, 06:20 PM
00JGC00
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Change fluid and filter. Do NOT flush with that many miles.

"The" Matt | '00 Limited WJ | "The White Wolf" aka "Willow" aka "Cool Whip" aka "Sweet 'N Low" aka "AKA"
Utah JeepCrew #39 | Club Matt #1
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post #15 of 22 Old 01-07-2010, 06:27 PM
02Lightning
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Quote:
Originally Posted by 00JGC00 View Post
Change fluid and filter. Do NOT flush with that many miles.
What would this hurt as long as you don't "power" flush it?

1995 Jeep Grand Cherokee Limited 4.0L NP249 Transfer Case, 42RE, 212,000 miles
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