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-   -   Transmission Downshifting Issue... (http://www.jeepgarage.org/f5/transmission-downshifting-issue-7798.html)

Jesse 03-23-2010 04:05 PM

Transmission Downshifting Issue...
 
Hi this is my first post I've checked out several other forums but everyone here seems very helpful, so here I am.

The vehicle is an 05 3.7 with 32,500 miles I have owned it for about a month and have had this issue since day one. The problem occurs when either coasting to a stop or braking coming to a stop. The transmission will downshift hard from 3-2 and sometimes 2-1 causing a small jerking of the jeep and occasionally a light clunk. The most noticeable is the 3-2 shift which happens around 20mph with the engine around 1000 rpm (under braking, not acceleration.) The revs will then jump up to 12-1500 rpm as if the transmission was downshifting prematurely. Around 50 percent of the time the shift is not noticeable, the rest is a mix somewhat noticeable, to downright alarming. Fluids are fine, all up shifts are smooth as are downshifts under acceleration, and the problem is not temperature related. My gut instinct is that it is a programming issue due to the relative consistency but I would like some info/ammo before consulting with a technician.

Thanks!

Scottina06 03-23-2010 04:13 PM

Re: Transmission Downshifting Issue...
 
def. sounds like a tcm issue. There is a tsb for the 4.7 for some similar things

B.P.O.D 03-23-2010 04:13 PM

Re: Transmission Downshifting Issue...
 
welcome jesse, hopefully one of our jeep gurus will chime in soon and be able to help you out!

05wkguy 03-24-2010 01:23 AM

Re: Transmission Downshifting Issue...
 
You say the fluid levels are fine BUT-my 3.7 will do the same thing-with downright violent, part throttle upshifts if the level gets below half way in the safe area on the dipstick. Are you in the safe area or actually full?

Jesse 03-24-2010 07:42 AM

Re: Transmission Downshifting Issue...
 
At operating temp the fluid level is about an eighth of an inch below "hot". Completely cold the level is about an eighth of an inch above "cold". Are they really that picky that a tenth of a quart can affect shifting patterns?

05wkguy 03-25-2010 02:45 AM

Re: Transmission Downshifting Issue...
 
I can always tell when mine is getting a bit low by how it shifts. Gotta get those cooler lines replaced.....

Jesse 03-31-2010 03:48 PM

Re: Transmission Downshifting Issue...
 
For anyone interested the issue appears to have been solved with a software update.

dsalinas 03-31-2010 08:27 PM

Re: Transmission Downshifting Issue...
 
I had this problem with my 07 4.7 back in the day. I never took it in to get looked at, but there was a very rough downshift around 3-2nd as your describing. the 3.7 has a different tranny though. Either way I would take it to get looked at. Software update should fix the issue.

brentseland 05-24-2010 09:12 PM

Re: Transmission Downshifting Issue...
 
Wha da ya mean If were interested. Of course were interested, thats why were here.

lll2for3lll 12-26-2010 05:20 PM

Re: Transmission Downshifting Issue...
 
I'm going to be taking my Jeep in next week for the same issue. I'll let you all know what happens.

ohioscott 12-27-2010 09:14 PM

Re: Transmission Downshifting Issue...
 
I have some similar issue with a 06 WK with the 4.7L. The shift is not nice at times. about the same range during a downshift. I have asked the local garage about it before a service and was told there was nothing wrong... I took it in again under a month ago specifically with this in mind and the mechanic drove it around and checked for service notices and told me there was nothing wrong and Jeep has no service bulitins about it. Nothing done either time. I am at a loss.

I will be interested to see if you have anymore luck than I did.

lll2for3lll 12-27-2010 09:19 PM

Re: Transmission Downshifting Issue...
 
I contacted the Jeep international customer service and they said that it is not normal behavior and will talk with the service department at the dealer. I have a case number and everything.

There was a recall for this issue for the 3.7L. It's code E13. I'm hoping a software update or reprogramming will fix this issue.


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