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Old 05-05-2010, 08:20 PM   #1
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42RLE sucks!!!

yeah, it's acting up again.

during the winter, i had a bout with torque converter chatter. this issue was solved with a PCM flash...or so i thought. well, 3000 miles later, it's back. at least my transmission is shifting normally though.

i'm installing larger tires soon, so with OD constantly off, and a superchips programmer in the near future...maybe it will stop. if it doesn't, i'm not getting it replaced with the same POS converter from the dealer. so i have a few questions...

have any of you modified the 42RLE? i'd like to find a TC that's compatable with the 3.8L and 42RLE. is that possible? i'd figure that i would put one in with my transmission cooler probably near the end of summer.

also, is anyone aware of any ATF4 additives to remedy chatter? i've seen Dr. Tranny (i know, sounds like a porno movie ) in parts stores and it claims to stop this lousy trans behavior. does it work? i'd imagine it's like a friction modifier like LSD additive for differentials. i don't know ANYTHING about modding transmission fluid.

what do ya'll think? i've dropped slushies before and screwed around with them, but i'd like to not burn mine up by jacking around with it. at the same time though, i'm not paying some dipsh*t at a trans shop to rebuild it. it doesn't need rebuilt, but i know they'll tell me that. as of right now, the trans is ok. it runs a little hot, but it shifts ok, color and smell is good, it's just my TC, hell maybe the TCM is the root of the JK's trans issues?

i don't know yet but i'm seriously about to start messing around with this POS transmission. i'd love to override the TCM and prevent the lockup from 3rd into 4th, but that would cause temp issues on a transmission already recalled for heat. i'm sure playing with the solenoids would neuter my jeep, so uhhhhh....

how's dr tranny work? any TC's compatable?

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Old 05-07-2010, 07:06 PM   #2
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Bump

come on. I know SOMEBODY here had the stones to mess with this thing

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Old 05-07-2010, 07:32 PM   #3
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Sorry for your TC trouble, mine has been perfect and the only mods I've made to my xmission, have been aux cooling and temperature of hot fluid out and cool fluid in--

I don't know of any experiments on the xmission, or Torque Converter, by the performance groups like B&M, sorry

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Old 05-07-2010, 10:35 PM   #4
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Yeah, I just don't really know what to do about it. It's just an annoyance. But I'd be willing to put time and money in to correct.

I'm about 90% sure this is a TCM issue. I just got back and played with it alot. The torque converter clutch simply engages at too low of an RPM under light throttle and load IMO. Therefore, based on my mechanical experience, a new flash involving a change in "shift schedule" should correct the shudder. We already know that modification of the shift patterns correct the "slow response throttle" and also the "engine bogging" issues all JK's experience. I bet that fix helps the TC chatter.

I'm changing my mind. The TC isn't the problem, much like the gas pedal isn't the problem with the lack of throttle response...it's the software.

Problem with the flashpaqs is shift point can be manipulated, but TC lock can't. Now the question is, how can this be over-ridden?

JIMBOX--what trans fluid brand are you running and how often do you change?
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Old 05-08-2010, 08:50 AM   #5
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Heh Heh, yea I think the shudders you are feeling are more a hydraulic/clutch/gearing coordination than a TC problem

I've heard a lot about the "superchip", now thats a little expensive for you, just for a sys check, but it might do the trick !!

My auto fluid is the stock ATF-4 and I haven't changed it yet, the little I added after mods, is just KRAGENS, compatible, I'm still low in mileage and with my mods I haven't had any heat troubles !!

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Old 05-08-2010, 10:18 AM   #6
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I've got the stock stuff too still.

I'll be getting a superchips probably next month some time. The tires are going to screw up my speedo and shift points, so that's getting corrected ASAP. A trans cooler July or August.

Thanks for the help. I'll just wait and see I guess. Perhaps with large tires, OD off, and a superchip...it'll keep my needle out of the 1600-1900 RPM range. My fingers are crossed.
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Old 05-08-2010, 11:57 AM   #7
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KEWL, but remember, the 3.8L engine operates best (Sustained) at 2300 RPM ie; oil press/wear/op temp and that will keep the magnificant torque available and a little compromise in mileage, but not much !!


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Originally Posted by GroundHawg View Post
I've got the stock stuff too still.

I'll be getting a superchips probably next month some time. The tires are going to screw up my speedo and shift points, so that's getting corrected ASAP. A trans cooler July or August.

Thanks for the help. I'll just wait and see I guess. Perhaps with large tires, OD off, and a superchip...it'll keep my needle out of the 1600-1900 RPM range. My fingers are crossed.
I think the Superchip will help quite a bit--Good luck

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Old 05-08-2010, 01:52 PM   #8
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I agree 100% with what you said. I've got 32's, 4.11 gears, and with OD off I'm between 2100 and 2800 depending how hard I'm on it, and the jeep drive awesome MPG and powerwise. Even at 3000-3400rpm in 3rd I enjoy it's ride. I'm guessing a 32" to a 35" tire will drop my rpm's 300ish. The chip with no OD should keep that needle over 2000 no sweat. At least that's my logic

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