08 jku wont down shift in overdrive - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 5 Old 03-01-2018, 03:18 AM Thread Starter
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08 jku wont down shift in overdrive

I might be posting in the wrong place but... Has anyone had this issue? 3.8 5.38 gears 37s AEV procal. Drives like a stock jeep but it really hates any sort of hill in OD. Any feedback would be cool
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post #2 of 5 Old 03-01-2018, 04:32 AM
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I have an '09 on 34s with 5.38s, AEV ProCal that seems to downshift fine...

'09 JK, Dynatrac ProRock 44, 5.38s, ARBs, NV 241OR transfer case, Yukon 1310/1350 driveshafts, JK8 brakes, Hydroboost booster, Evo sway bar disconnect, ect...
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post #3 of 5 Old 03-01-2018, 05:35 AM
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37s 3.8l , 42RLE auto , 5.13 gearing = I know what OP contends with. If aproching hill , Off I turn the OD.
I manually shift the 11 ( no tap shift like 12 & newer) from 1,2,D then on flat straights , D+OD . Some hills even require downshifting into 2 . Done this for 90,000 plus miles. Tuners can sortof accommodate gear and shift points but not well enough to use it as an auto completely , fwiw.

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post #4 of 5 Old 03-01-2018, 01:42 PM
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I just hit the OD OFF button when approaching a hill that I think the computer will hold OD too long. Hit it again when near the top.
Been working great for 157,000 miles.

It's an automatic, but that doesn't mean you can't control it yourself when needed.
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2008 Unlimited Rubicon Automatic

Last edited by ronjenx; 03-01-2018 at 01:44 PM.
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post #5 of 5 Old 04-09-2018, 04:27 AM
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Superchips offers a tranny tuner add-on. It made a world of difference getting the tranny to downshift on hills. I had it tuned so any uphill load with slight throttle input would kick her down, but on level ground it took a bit more throttle to get it to downshift. It was still a bit of a compromise between these two situations but it was drastically better than stock.

2007 JKU Sahara........................... 2015 JKU Sahara
5.3/6l80E......................................2.5" Rock Krawler Expedition Stage-1
Teraflex 44 front, Stock 44 rear........35's
Bastard lift
Totaled; being rebuilt
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