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Old 03-31-2016, 08:29 PM
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2003 rubicon auto bucks intensely when cold

So it's been a while since I've posted on here. I actually no longer have the yellow jeep in my profile. I need to update all my info. Now I have a 2003 jeep rubicon auto with 21k miles. It's got a 4 inch lift (13 years old so probably has sagged) and 33x12.50x17 mickey Thompson mtz's on spyderlocks. Last year when it had started to get cold I noticed that when my jeep would want to shift from 1st to 2nd gear it would buck intensely 2 or 3 times before it finally shifted and the rpms would rise and fall as well. But the strange part is it would only do it when the oil is cold, once it heats up it shifts fine. I understand that auto trannies work off pressure and with colder temperatures it makes the oil thicker and therefore creating a higher pressure but I don't think that it should be bucking like that. And just the other day the ambient temperature outside was around 65 degrees and it still did it. If anyone has had this similar issue or knows what could be wrong I would appreciate some input.

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Old 03-31-2016, 09:36 PM   #2
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Have you done a service on the transmission ever ? If you haven't personally I'd drop the pan, change the filter, replace the lost fluid. If you want to a step further after that take it up to a shop & have them do a Complete Exchange, that will replace 100% of the old fluid. ATF+4 is the fluid type.
Great looking Tj BTW

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Old 03-31-2016, 09:47 PM
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Thank you! She's my pride and joy. Service work on tranny, yes I have done it. When I first bought the jeep I dropped the pan and replaced the filter as a preliminary measure but didn't do a complete oil swap. Drove it around for a while, then noticed that I didn't seal it correctly so I dropped the pan again and resealed it correctly. This was all during the summer time btw. When it started getting cold I noticed it doing the bucking (Nov of 2015). In the beginning of this year (january) I was out wheeling and smashed the auto tranny pan, broke the seal and was leaking fluid. I got it home and replaced the oil pan and filter and correctly sealed it back and did a FULL atf +4 flush by removing one of the tranny lines and pumping out all the old fluid while continously adding more. The fluid is at the right level now.
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Old 04-03-2016, 02:12 AM
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anyone?
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Old 04-03-2016, 10:22 AM   #5
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Quote:
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anyone?
Saw your post saying you have a programmer. I'd say that's probably your issue
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Old 04-03-2016, 01:47 PM
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Saw your post saying you have a programmer. I'd say that's probably your issue
You think so?
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Old 04-03-2016, 09:31 PM   #7
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You think so?
Honestly yeah it might cause more air to enter when it's cold out. I'm no expert by any means on programming vehicles but that'd be my guess

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