A Dakota owner with a transmission question
#1
09-17-2014, 10:41 PM
A Dakota owner with a transmission question
Please humor a Dakota owner who has wondered in with a tranny question... I know many of you have the same setup in your trucks, so I thought you might have an answer.
My 545RFE transmission has an anti-drainback valve in one of the cooler lines to prevent torque converter drain when the truck is sitting for long periods. Why does the Mopar cooler return filter also have an anti-drainback valve? This is a spin on filter, sitting inside the tranny, in an inverted position..... so what component is it preventing drainback for? Is it redundancy to prevent torque converter drain?
See TSB Below which describes issue with TC draining. Why would it drain when the cooler line anti drainback valve is also preventing drainage?
TSB NUMBER: 21-015-05 9/1/2005
"A/T - 45RFE/545RFE Delayed Engagement After Filter R&R"
OVERVIEW:
This bulletin involves a transmission delayed shift condition that may occur following the replacement of the internal cooler return filter.
MODELS:
2000 - 2004 (AN) Dakota
2000 - 2003 (DN) Durango
2003 - 2006 (DR) Ram Truck
2004 - 2006 (HB) Durango
2002 - 2006 (KJ) Liberty
1999 - 2004 (WJ/WG) Grand Cherokee
2005 - 2006 (WK/WH) Grand Cherokee
2006 (XK) Commander
NOTE : This bulletin applies to vehicles equipped with a 45RFE or a 545RFE automatic transmission (sales code DG4 or DGQ respectively).
DISCUSSION:
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.
The customer may not have experienced the delayed shift engagement until after the transmission has been serviced, where the cooler return filter was replaced during the service and/or repair.
The condition is not detrimental to the transmission but may cause concern with the customer.
The above condition may be caused by a suspect cooler return filter a part number of 04799662AB. This "AB" suffix / level filter may allow transmission fluid to drain back out of the torque converter. The drain back condition may occur over a period time when the engine (and transmission) are not running. With less fluid in the torque converter a delay in gear engagement may occur at engine start up while the torque converter fills to its proper fluid level.
All 04799662AB cooler return filters with the "AB" suffix are suspect. The above condition may be corrected by replacing a suspect "AB" filter with a new cooler return filter whose part number is 04799662 (with no suffix or with a suffix that is other than the "AB" level).
NOTE :The cooler return filter, p/n 04799662, will not be available until September 09, 2005. The filter part number is stenciled on the side of the filter case.
My 545RFE transmission has an anti-drainback valve in one of the cooler lines to prevent torque converter drain when the truck is sitting for long periods. Why does the Mopar cooler return filter also have an anti-drainback valve? This is a spin on filter, sitting inside the tranny, in an inverted position..... so what component is it preventing drainback for? Is it redundancy to prevent torque converter drain?
See TSB Below which describes issue with TC draining. Why would it drain when the cooler line anti drainback valve is also preventing drainage?
TSB NUMBER: 21-015-05 9/1/2005
"A/T - 45RFE/545RFE Delayed Engagement After Filter R&R"
OVERVIEW:
This bulletin involves a transmission delayed shift condition that may occur following the replacement of the internal cooler return filter.
MODELS:
2000 - 2004 (AN) Dakota
2000 - 2003 (DN) Durango
2003 - 2006 (DR) Ram Truck
2004 - 2006 (HB) Durango
2002 - 2006 (KJ) Liberty
1999 - 2004 (WJ/WG) Grand Cherokee
2005 - 2006 (WK/WH) Grand Cherokee
2006 (XK) Commander
NOTE : This bulletin applies to vehicles equipped with a 45RFE or a 545RFE automatic transmission (sales code DG4 or DGQ respectively).
DISCUSSION:
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.
The customer may not have experienced the delayed shift engagement until after the transmission has been serviced, where the cooler return filter was replaced during the service and/or repair.
The condition is not detrimental to the transmission but may cause concern with the customer.
The above condition may be caused by a suspect cooler return filter a part number of 04799662AB. This "AB" suffix / level filter may allow transmission fluid to drain back out of the torque converter. The drain back condition may occur over a period time when the engine (and transmission) are not running. With less fluid in the torque converter a delay in gear engagement may occur at engine start up while the torque converter fills to its proper fluid level.
All 04799662AB cooler return filters with the "AB" suffix are suspect. The above condition may be corrected by replacing a suspect "AB" filter with a new cooler return filter whose part number is 04799662 (with no suffix or with a suffix that is other than the "AB" level).
NOTE :The cooler return filter, p/n 04799662, will not be available until September 09, 2005. The filter part number is stenciled on the side of the filter case.
#3
09-21-2014, 06:55 AM
