Do I have a 45RFE? And a 45RFE upgrade question... - JeepForum.com
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Unread 08-13-2013, 11:05 PM   #1
jewfromdahood
Registered User
2003 KJ Liberty 
 
Join Date: Apr 2011
Location: Columbus, OH
Posts: 184
Do I have a 45RFE? And a 45RFE upgrade question...

It's a 2003 Jeep Liberty Sport I've slowly been upgrading. Build date is August of 2002. And if it is a 45RFE... Is there a way to upgrade it to a 545RFE, because I have heard if I am not mistaken that it adds a fifth gear.
Might be worth it for me on the highway...

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2003 Jeep KJ Liberty Sport with 3" Lift Rockfather Deluxe Lift from RRO (It was a gift from my grandparents back off, it was a thanksgiving surprise when they picked me up from the airport, and I saw it lifted) with all OME shocks, and front OME coils, ARB Steel bumper. 2 12" Kenwood Subs, 300 Watt RMS Mono Amp, Alpine Type-S door speakers
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Unread 08-14-2013, 08:18 AM   #2
oldfamilyguy
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Join Date: Dec 2008
Location: oakville, canada
Posts: 791
the good news is that trans if you have it should outlive everything else on the truck. bad news is what you heard about reflashing for the 5th gear. its simple enough, but dealer only has the software and applies to earlier Grand Cherokee WJ models with 4.7' s and not libbies. Now maybe someone has figured it out, I guess its possible. I looked into it a bit some time ago for my daughters lib but never found anything, but I didn't look that hard really.
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Unread 08-14-2013, 02:10 PM   #3
TwoBobsKJ
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2003 KJ Liberty 
 
Join Date: May 2011
Location: Northern, OH
Posts: 571
Quote:
Originally Posted by jewfromdahood View Post
It's a 2003 Jeep Liberty Sport I've slowly been upgrading. Build date is August of 2002. And if it is a 45RFE... Is there a way to upgrade it to a 545RFE, because I have heard if I am not mistaken that it adds a fifth gear.
Might be worth it for me on the highway...
Count the number of bolts in the transmission pan. If you have 13 bolts you have the 42RLE; if you have 15 bolts you have the 45RFE.

As for changing the gearing - nope. That is set in the computer and as far as I know there is no way to change it. HOWEVER...

tjkj2002 may be able to offer more credible information than I can have since I've never had to contemplate the good fortune of having a 45RFE. My '03 Libby is blessed with the 42...

Bob
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2003 Renegade, Black
- 3.7L, 42RLE, 4.10's, 4X Guard Trans skid, Factory Engine, T-case, Tank skids, Modded BoulderBars sliders, OME 927/948, Bilsteins, JBA A-Arms & 1/4" top plate, 1 extra rear iso/side, Moabs with Firestone Destination AT's 255/70-16
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Unread 08-20-2013, 08:25 PM   #4
Bain98xj
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1998 XJ Cherokee 
 
Join Date: Dec 2009
Location: howell
Posts: 395
Having a 5th gear would be awesome for all the hwy driving I do.
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