Tranny temp issues
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,698
Likes: 2,620
From: SE Florida
It's not that reverse is weak, it's the way the trans is used in reverse.
First, there is very little airflow over the trans cooler in reverse. Second, reverse is usually very low speed, which means a large slip ratio in the torque converter. This creates A LOT of heat. And with little or no airflow, there is nowhere for all that heat to go, so it stays in the trans.
Using 4L for backing adds a ratio of 2.7:1 to reverse gear, reducing the load on the trans 2.7 times.
First, there is very little airflow over the trans cooler in reverse. Second, reverse is usually very low speed, which means a large slip ratio in the torque converter. This creates A LOT of heat. And with little or no airflow, there is nowhere for all that heat to go, so it stays in the trans.
Using 4L for backing adds a ratio of 2.7:1 to reverse gear, reducing the load on the trans 2.7 times.
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Joined: Feb 2017
Posts: 22
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It's not that reverse is weak, it's the way the trans is used in reverse.
First, there is very little airflow over the trans cooler in reverse. Second, reverse is usually very low speed, which means a large slip ratio in the torque converter. This creates A LOT of heat. And with little or no airflow, there is nowhere for all that heat to go, so it stays in the trans.
Using 4L for backing adds a ratio of 2.7:1 to reverse gear, reducing the load on the trans 2.7 times.
First, there is very little airflow over the trans cooler in reverse. Second, reverse is usually very low speed, which means a large slip ratio in the torque converter. This creates A LOT of heat. And with little or no airflow, there is nowhere for all that heat to go, so it stays in the trans.
Using 4L for backing adds a ratio of 2.7:1 to reverse gear, reducing the load on the trans 2.7 times.
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