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Which Line Is Return? 4L60E

8K views 1 reply 2 participants last post by  Deeze49686 
#1 ·
I am going to install a trans cooler in my 99 Xtreme with 4.3 and 4L60E. I am supposed to hook the cooler up on the return line. There are 2 lines that run from the trans to the radiator. One connects to the top of the radiator and the other connects to the bottom of it.

Which is the return line?

Thanks!
 
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