42 RLE Full Flush or Not? - JeepForum.com
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post #1 of 29 Old 01-08-2016, 10:02 AM Thread Starter
hooey
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42 RLE Full Flush or Not?

I have a 2004 Rubicon with the automatic 42 RLE transmission. I have 47,000 on the odometer, been reading many different opinions about transmission service. What do you all think, should I do a full flush and fluid replacement or just drop the pan and change the filter?
Thanks

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post #2 of 29 Old 01-08-2016, 10:21 AM
timberwolf0122
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Drop the pan, new filter, filler her back up. At 47,000 there is no reason for a flush.

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post #3 of 29 Old 01-08-2016, 01:02 PM
TJCrawling
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How about at 105000?
The hack at Jiffy Lube said if it went past 105K that you shouldn't flush it, I think he was just trying scare tactics to get me to do it right then. Told him I would take care of it.
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post #4 of 29 Old 01-08-2016, 01:22 PM
Jerry Bransford
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I'm always one for a full flush which gets rid of all the gunk instead of less than half of it. The rumors that a transmission shouldn't be flushed if it's old are old wive's tales. If a problem crops up after a full flush, it was ready to happen anyway.

Make sure to only use ATF+4.

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post #5 of 29 Old 01-08-2016, 02:08 PM
Unlimited04
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Quote:
Originally Posted by hooey View Post
I have a 2004 Rubicon with the automatic 42 RLE transmission. I have 47,000 on the odometer, been reading many different opinions about transmission service. What do you all think, should I do a full flush and fluid replacement or just drop the pan and change the filter?
Thanks
I have always done the full flush, new ATF4+ and new filter every 30k miles.

My 42RLE blew up at 52k miles. Currently at 115k and waiting for it blow again.

I hope you have one heck of a trans cooler installed, because these things run hot from the factory.

Good luck.
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post #6 of 29 Old 01-08-2016, 02:27 PM
jeepinjeffrey
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I don't know why you wouldn't just do a full flush to get all the old fluid out. I would Just spend a little bit more and do it all.

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post #7 of 29 Old 01-08-2016, 06:08 PM
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It's stupid not to do a full fluid replacement. Why would you want to keep the majority of the old fluid in your transmission. Dropping the pan are topping back off is only replacing 1/3 of the total fluid capacity.

You can also do it your self and save some $$$.
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post #8 of 29 Old 01-08-2016, 11:20 PM
pagrey
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I wouldn't do anything other than what the factory service manual recommends. If you are concerned about the condition of the fluid then send it to be analyzed when you change the filter. I use Blackstone Labs and with the price of ATF4 these days it costs less then a flush. If I'm going to waste my time and money on something outside of the regular service I'll wait until my analysis shows I need it. If the flush makes you feel better I hear Walmart has ATF4 cheap...
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post #9 of 29 Old 01-09-2016, 07:24 AM
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While one instance is not a pattern and could be an outlier, I'll say my 42RLE is at 158+k miles with no troubles and I'm not sure it's ever been fully flushed. If it was it was done over 100k miles ago. If I'm being completely honest, I probably haven't even changed a portion of the fluid or the filter regularly enough. Well, maybe if you count a couple times I lost a lot of fluid from a cut line my "maintenance" might have been enough.

What I have done is run a nice supplemental cooler for most of its life. Like Unlimited04 mentioned above, I think that is multiple times of importance relative to the fluid when it comes to this transmission.

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post #10 of 29 Old 01-09-2016, 09:38 AM
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Quote:
Originally Posted by Unlimited04 View Post
I have always done the full flush, new ATF4+ and new filter every 30k miles.

My 42RLE blew up at 52k miles. Currently at 115k and waiting for it blow again.

I hope you have one heck of a trans cooler installed, because these things run hot from the factory.

Good luck.
I flushed mine by disconnecting the line method.

Mine blew after 69k of non hard miles.

Did the trans-go kit,external filter,inline thermostat and a Derale cooler/w-gauge.

Runs cooler now,time will tell currently @ 86k.

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post #11 of 29 Old 01-09-2016, 09:44 AM
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Quote:
Originally Posted by Jerry Bransford View Post
I'm always one for a full flush which gets rid of all the gunk instead of less than half of it. The rumors that a transmission shouldn't be flushed if it's old are old wive's tales. If a problem crops up after a full flush, it was ready to happen anyway.

Make sure to only use ATF+4.
Thanks Jerry, that's what I was thinking but its good to hear from others.
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post #12 of 29 Old 01-12-2016, 09:55 AM
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There are some old wives out there who report tranny troubles after having them flushed, especially if there are a lot of miles on the old fluid. Me, I'm married to an old wife. So, I installed a drain plug and drain the pan (about 6 quarts) every 20K or so, and every other drain change the tranny filter. Using a Lubelocker gasket makes the filter changes a lot easier and quicker.
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post #13 of 29 Old 01-12-2016, 11:52 AM
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Jerry, when you say you support a full flush, does that include the reverse flushes that most shops do now. I still hear about problems after having that done on older vehicles.

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post #14 of 29 Old 01-12-2016, 02:26 PM
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Quote:
Originally Posted by Airstreamer67 View Post
There are some old wives out there who report tranny troubles after having them flushed, especially if there are a lot of miles on the old fluid. Me, I'm married to an old wife. So, I installed a drain plug and drain the pan (about 6 quarts) every 20K or so, and every other drain change the tranny filter. Using a Lubelocker gasket makes the filter changes a lot easier and quicker.
I installed one of these. This way I no longer need to drop the pan and make a mess. I also can simply disconnect the input line and pump out all the old ATF in the system. Replace with a hydraulic filter that is 10 times more efficient than the internal filter and do so standing up in just a few minutes.

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post #15 of 29 Old 01-12-2016, 09:48 PM
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Another location for the transmission add-on filter:





...
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