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Discussion Starter #1
Grasping at straws here...throwing code P0731 which appears to be the bastion of doom. That said, thought I'd at least throw it out there after reading thru other threads. I am only running 33's G2's on my `09 JKU, no gear change. Jeep has been "searching" for gears for about a year, but basically attributed it to all the things done a once: rear main seal, trans flush, RR snorkel w/k&n filter, etc., so didn't put too much thought into it as it was otherwise running well...until yest, when I had to hit brakes hard on freeway, loss of power, went to N, back to drive, and all was normal. Same thing happened on way home (rush hour, not angry driver, well, not this time-rush hour), and tran light came on. Was able to drive 25mi rest of way home, normally, no limp. When I say "searching" for gears, it basically stutters between 2nd-3rd, 4th-5th, but not an actual slip out of gear, or loss of power. So, my underlying question in all this is; would using a flashpaq (or similar) to change shift points (and a cooler) possibly fix my problem...or just rub some dirt on it and walk it off?
 

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How many miles on the Jeep when you did the trans flush? Is that the first time the trans fluid was changed? Have you checked your trans fluid level?

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How many miles on the Jeep when you did the trans flush? Is that the first time the trans fluid was changed? Have you checked your trans fluid level?

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Fluid was 1st thing I checked, both warm and cold. All good. The flush was done by trusted shop at 110k after a hot oil light on beach (FL). Guys said fluid ok, not burnt, and didn’t not see any shavings of note. Attributed it all to mileage and hard driving at Jeep Beach few mo. prior. Aprox 144k mi now. Only minor mudding and weekly beach drive (just to park/leave).
 

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it is a 3.8 or 2.8 diesel?

Because if it´s a 3.8 it has 42RLE what is a 4 speed auto.

In 2009 was 5 speed auto (545RFE) available only with diesel


If you run 33 with stock gears it is a tragedy. Especially with Sahara nad 3.73 gears.
It will hunt for gears, downshift with every touch of gas or slight uphill, mileage sucks....and the 42RLE tranny itself is quite weak, so the more you put on it the sooner it breaks.

My co-worker has Sahara which came with 3.73 and regear to 5.13 was the first job after purchase


Mine is an X-trim and came stock with 4.1 gears. With stock tyres it was somehow acceptable, but i would say 4.56 should be stock gearing or 4.88 for 31-32 tyres.


I am on 35" Coopers now (actual size is 34.5) and i am happy with 5.13
 

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Discussion Starter #5
You're obviously 100% correct...its the 42LRE. Sorry, was just being dumb and could fix once posted amidst my haste, frustration, and that pesky OD it loves to search for, and you so aptly described!
 
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