Automatic gearbox

[Pimpon]

What's that tube on the box, I don't have one on the other?

[ScrapIron]

Its a transmission cooler oil bypass line. Maybe this link will help...

https://www.dieselsite.com/4r100tran...deletekit.aspx

[Pimpon]

Originally Posted by ScrapIron

Its a transmission cooler oil bypass line. Maybe this link will help...

https://www.dieselsite.com/4r100tran...deletekit.aspx

I don't really see what it's for, in the end, it's mandatory or not ...

[ScrapIron]

From 1999-2003 the Ford 4R100 automatic transmission had an external cooler bypass tube that redirected transmission fluid from the pump output back to the return line of the transmission. The bypassing of the cooler was supposed to happen until the fluid reached operating temperatures.

Unfortunately, these bypass tubes commonly fail which prevents transmission fluid flow to the cooler. Another design flaw is, even when operating perfectly, the bypass never fully closes. This means not all fluid is ever sent to the cooler... ever.

The result? Your transmission will overheat.

[Pimpon]

Originally Posted by ScrapIron

From 1999-2003 the Ford 4R100 automatic transmission had an external cooler bypass tube that redirected transmission fluid from the pump output back to the return line of the transmission. The bypassing of the cooler was supposed to happen until the fluid reached operating temperatures.

Unfortunately, these bypass tubes commonly fail which prevents transmission fluid flow to the cooler. Another design flaw is, even when operating perfectly, the bypass never fully closes. This means not all fluid is ever sent to the cooler... ever.

The result? Your transmission will overheat.

Thank you for your explanation, it is better that I remove this tube is that I put the other 2 tubes of the other box ?