Wife came home in her 07 Pacifica witht he 4.0 engine complaining of an "awful noise". My friend and I jumped in and took it for a test ride. Everything worked as it should have but when the automatic transmission shifted from 2nd-3rd it made a loud squeal. Then it did it again going from 5th-6th. We then came to a stop and put it into manual shift mode and started upshifting and the noise happened again. Now it doesn't seem to matter if you are upshifting or down shifting and only makes the noise in those 2 gears. Granted the noise is louder while upshifting as the car is under more of a load.
Since the car doesn't have a transmission dipstick and I need to get one from the dealer to check the tranny fluid, I'm at a stand still until the dealer opens tomorrow. I'm just hoping it is maybe a little low. There is no real noticable leaks on the ground but it is pretty dirty under the hood. I will pressure wash the engine bay tomorrow and try to get the dip stick to check the tranny fluid.
Anyone have any ideas?

Thanks

 

Not sure if this is the condition that your experiencing but take a look at the TSB info below, perhaps a simple software flash can correct the concern.

TSB #21-002-09

SUBJECT:
Flash: Automatic Transmission Shift Improvements

OVERVIEW:
This bulletin involves flash reprogramming the Powertrain Control Module (PCM) with new software, Clear the Variable Line Pressure (VLP) Counters and Perform the Quick Learn function.

MODELS:
2007 - **2008** (CS) Pacifica
NOTE: This bulletin applies to CS models built with a 4.0L engine with a 62TE automatic transmission (Sales Codes EGQ and DG2) or a 3.8L engine equipped with a 41TE automatic transmission (Sales Codes EGH and DFF).

SYMPTOM/CONDITION:
The vehicle operator may experience one or more of the following symptoms:
i. **Complaints of overall shift quality (All transmissions)**
ii. **During a rapid coast down while braking a bump may be felt just before a stop**(All transmissions)**
iii. **1 - 2 upshift Improvement (41TE transmissions)**
iv. **3 - 2 - 3 change mind shift bump (41TE transmissions)**
v. 3 - 2 kickdown bump or harshness (62TE transmissions)
vi. Too sensitive accelerator pedal response on initial tip in (squeal tires)(62TE
transmissions)
vii. MIL illumination for P050D - Cold Start Rough Idle (62TE transmissions)
viii.No vehicle movement in reverse due to CVI index learning to 0 (62TE
transmissions)
ix. Tip in hesitation after a cold start. Engine coolant temperature is below 80° F (26° C)
(62TE transmissions)
x. **2 - 3 upshift bump or harshness (62TE transmissions)**
xi. **4 - 3 - 4 change mind shift bump (62TE transmissions)**

The software update will remove steady state partial lockup.

 

Is there more than 1 transmission flash? I recently had a trans flash that sounds like this and it seems to have caused more problems than it fixed. Shifts are harsher and fuel economy has gone in the crapper.