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Unread 01-29-2012, 02:21 PM   #1
bugs37
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Join Date: Aug 2010
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JK Tranny upgrades

As I save up cash towards a ripp kit...Experience just has me asking one question. Is there anything for the tranny. Im used to messing with diesels in the past and general rule of thumb was that you could add 70ish hp and be able to rag on it not really have any tranny issues, but anything more than that and you COULD have some issues. Im sure the jeep stock auto is nowhere near as strong as those so Im just curious that when I upgrade to the ripp that the tranny is going to be the weak link. (I'm not questioning the ripp kit, it has spoken for itself as far as engine safety and drivability). Are there any tranny upgrade, rebuild kits or trans upgrades in general for the stock auto...Other than a trans cooler???

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Unread 01-29-2012, 02:41 PM   #2
ronjenx
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I was at a transmission shop the other day asking a similar question. The guy is familiar the 42RLE, and is not aware of any significant upgrades for it.

On the other hand, I have not heard of a lot of transmission failures from the extra power of the RIPP kit.
There have been one or two, but they probably would have failed anyway, as some of the 42RLE's have under normal conditions.
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Unread 01-29-2012, 04:43 PM   #3
jabsther
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Only thing I would do/know of is adding an aux cooler on.
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Unread 01-29-2012, 05:27 PM   #4
RockyClymer
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The best upgrade (or add-on) to the auto is the Advance Adapters Rubicrawler....
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Unread 01-29-2012, 05:45 PM   #5
222Doc
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The only thing i could find out was the 42RLE only rating was "2" as in 1-10. Most trans are rated by torque loads or HP. Might be when people call the 3.8 a mini van motor, it may also include the auto in this discription. with out knowing what "2" is hard to say. put a cooler for sure as that is a known issue.

the 2012 auto 5speed W5A580
•W = Transmission using a hydraulic torque converter.
•5 = 5 forward gears [not always written out].
•A = Automatic transmission.
•580 = Maximum input torque capacity in Newton-meters (428 ft-lbs.)
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