There's a TSB on the problem:
http://dodgeram.info/tsb/2006/21-007-06.htmNUMBER: 21-007-06
GROUP: Transmission
DATE: April 07, 2006
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 21-016-05, DATED SEPTEMBER 01, 2005, WHICH SHOULD BE REMOVED FROM YOUR FILES. THIS IS A COMPLETE REVISION AND NO ASTERISKS HAVE BEEN USED TO HIGHLIGHT REVISIONS.
SUBJECT:
RFE Transmission Filters - Delayed Engagement And Related Transmission DTC'S
OVERVIEW:
This bulletin involves verifying the build date of the transmission, and if necessary, the replacement of both the cooler return and sump filters in the transmission.
MODELS:
2005 - 2006 (DR) Ram Truck
2005 - 2006 (HB) Durango
2005 - 2006 (KJ) Liberty / Cherokee
2005 - 2006 (ND) Dakota
2005 - 2006 (WK / WH) Grand Cherokee
2006 (XK) Commander
NOTE:
This bulletin applies to vehicles equipped with the a 45RFE or a 545RFE automatic transmission (sales code DG4 or DGQ respectively) having a specific transmission build date code (see the below DIAGNOSIS section for further details).
SYMPTOM/CONDITION:
The customer may experience an initial delayed shift engagement following an extended off (not running) period of time, generally after being parked overnight. The initial shift engagement may feel like a delay or slip when a transmission gear (reverse or drive) is first selected after engine start.
