42 RLE Full Flush or Not? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > 42 RLE Full Flush or Not?

Ruffstuff 10 year saleBDS 4-1/2" Suspension Lift Kit - Jeep Wrangler YJRough Country Lift Kits and Parts!

Reply
Unread 01-08-2016, 11:02 AM   #1
hooey
Registered User
 
Join Date: Jul 2014
Location: browns valley, CA
Posts: 5
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

hooey is offline   Reply With Quote Quick reply to this message
Unread 01-08-2016, 11:21 AM   #2
timberwolf0122
Registered User
2005 LJ Wrangler 
 
Join Date: Mar 2009
Location: Elmore(dor), VT
Posts: 18,459
Drop the pan, new filter, filler her back up. At 47,000 there is no reason for a flush.
__________________
Atheist Jeep Club Member #2
Doctor Who has died 13 times, is on his 14th regeneration and has a time machine, beat that Jesus.
timberwolf0122 is offline   Reply With Quote Quick reply to this message
Unread 01-08-2016, 02:02 PM   #3
TJCrawling
Member
 
TJCrawling's Avatar
2004 TJ Wrangler 
 
Join Date: Apr 2014
Location: Geneva, Illinois
Posts: 203
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.
TJCrawling is offline   Reply With Quote Quick reply to this message
Unread 01-08-2016, 02:22 PM   #4
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California, California
Posts: 63,507
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.
__________________
Getting Savvy...

When you have a choice, buy American.
Jerry Bransford is offline   Reply With Quote Quick reply to this message
Unread 01-08-2016, 03:08 PM   #5
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 24,078
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.
Unlimited04 is offline   Reply With Quote Quick reply to this message
Unread 01-08-2016, 03:27 PM   #6
jeepinjeffrey
Registered User
2003 TJ Wrangler 
 
Join Date: Jun 2011
Location: 4014′39.92″N 11139′38.89″W
Posts: 2,181
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.
__________________
2003 Wrangler Sport
4.5 Rubicon Express Lift|33" BFG KM2s|Ion Alloy 174|And never ending wish list!
jeepinjeffrey is offline   Reply With Quote Quick reply to this message
Unread 01-08-2016, 07:08 PM   #7
JBTJ
Registered User
2001 TJ Wrangler 
 
Join Date: Mar 2006
Location: Dallas, Texas
Posts: 11,528
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 $$$.
JBTJ is offline   Reply With Quote Quick reply to this message
Unread 01-09-2016, 12:20 AM   #8
pagrey
Registered User
2004 LJ Wrangler 
 
Join Date: Sep 2012
Location: Los Angeles, California
Posts: 47
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...
pagrey is offline   Reply With Quote Quick reply to this message
Unread 01-09-2016, 08:24 AM   #9
biffgnar
Moderator
 
biffgnar's Avatar
2006 TJ Wrangler 
 
Join Date: May 2008
Location: Westchester, NY
Posts: 17,762
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.
__________________
Thank you Dave Cole, Dynomax, Falken and all the Spec Class sponsors!!
biffgnar is offline   Reply With Quote Quick reply to this message
Unread 01-09-2016, 10:38 AM   #10
ravenworks
Web Wheeler
 
ravenworks's Avatar
2006 LJ Wrangler 
 
Join Date: Jul 2012
Location: NE, Ohio
Posts: 3,231
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.
__________________
Semper-Fi "81-84"
I.U.O.E. - 18
ravenworks is offline   Reply With Quote Quick reply to this message
Unread 01-09-2016, 10:44 AM   #11
TJCrawling
Member
 
TJCrawling's Avatar
2004 TJ Wrangler 
 
Join Date: Apr 2014
Location: Geneva, Illinois
Posts: 203
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.
TJCrawling is offline   Reply With Quote Quick reply to this message
Unread 01-12-2016, 10:55 AM   #12
Airstreamer67
Registered User
2003 TJ Wrangler 
 
Join Date: Nov 2008
Location: , Louisiana
Posts: 173
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.
Airstreamer67 is offline   Reply With Quote Quick reply to this message
Unread 01-12-2016, 12:52 PM   #13
1 Long CJ
Registered User
2006 LJ Wrangler 
 
Join Date: Nov 2005
Location: SW Illinois
Posts: 512
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.
__________________
Life is short. Play hard.

1979 CJ5, 1982 CJ8, 2004 WJ, 2006 LJ Rubicon
1 Long CJ is offline   Reply With Quote Quick reply to this message
Unread 01-12-2016, 03:26 PM   #14
JBTJ
Registered User
2001 TJ Wrangler 
 
Join Date: Mar 2006
Location: Dallas, Texas
Posts: 11,528
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.

JBTJ is offline   Reply With Quote Quick reply to this message
Unread 01-12-2016, 10:48 PM   #15
Knuckelhead
AFSOC Retired
 
Knuckelhead's Avatar
2000 TJ Wrangler 
 
Join Date: Aug 2005
Location: Colorado
Posts: 18,547
Another location for the transmission add-on filter:





...
Knuckelhead is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.