4T45E automatic transaxle clank/lurch upon engine start
09-12-2007, 04:27 AM
#11
Senior Member
Join Date: 07-19-2007
Location: Amherstburg, On Can.
Posts: 134
Garage "clunk" is a problem that has been around for years. It was really bad in the rear drive THM 350's & 400's, and the first THM 125's.
Since then, efforts were made to "vent" the forward clutch packs to prevent this movement, and it has diminished with many other improvements made over the years.
If the fluid level in the transmission were low, there will be a slipping condition, not a grabbing condition like the "clunk"
Since then, efforts were made to "vent" the forward clutch packs to prevent this movement, and it has diminished with many other improvements made over the years.
If the fluid level in the transmission were low, there will be a slipping condition, not a grabbing condition like the "clunk"
09-12-2007, 06:50 AM
#12
Senior Member
Join Date: 06-23-2006
Location: Northeast Ohio in the Lake
Posts: 578
Lone Ranger I found this:
Subject: Slight Vehicle Movement In Park At Start Up After Cold Soak - keywords 3T40 4L60 4L60E 4L65E 4L80E 4L85E 4T40E 4T45E 4T60 4T60E 4T65E 4T80E 5L40E 5L50E 6L50 6L80 6L90 6T70 6T75 AF225 AF235 aisan #PIP3763A - (01/05/2007)
Models: 2007 and Prior Passenger Cars and Light Duty Trucks
Equipped with Automatic Transmission
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some vehicles may rock or move slightly forward or rearward while in park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
Recommendation/Instructions:
This slight movement is due to the residual transmission fluid in the clutch packs that creates a partial apply on start up. This movement is stopped by the parking pawl and/or transmission fluid exhausting completely from the clutch packs.
This slight movement has no adverse affects on the transmission and no repair should be attempted. This condition is normal. This can be verified by comparing with another identically built vehicle under the same cold conditions.
To prevent this condition from occurring, the parking brake should be utilized as per Owner's Manual recommendations anytime the vehicle is parked.
Subject: Slight Vehicle Movement In Park At Start Up After Cold Soak - keywords 3T40 4L60 4L60E 4L65E 4L80E 4L85E 4T40E 4T45E 4T60 4T60E 4T65E 4T80E 5L40E 5L50E 6L50 6L80 6L90 6T70 6T75 AF225 AF235 aisan #PIP3763A - (01/05/2007)
Models: 2007 and Prior Passenger Cars and Light Duty Trucks
Equipped with Automatic Transmission
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some vehicles may rock or move slightly forward or rearward while in park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
Recommendation/Instructions:
This slight movement is due to the residual transmission fluid in the clutch packs that creates a partial apply on start up. This movement is stopped by the parking pawl and/or transmission fluid exhausting completely from the clutch packs.
This slight movement has no adverse affects on the transmission and no repair should be attempted. This condition is normal. This can be verified by comparing with another identically built vehicle under the same cold conditions.
To prevent this condition from occurring, the parking brake should be utilized as per Owner's Manual recommendations anytime the vehicle is parked.
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