I'm guessing the lower trans cooling line is the return line. Well, can I just use the upper cooling line to put the inline hose for the trans cooler? I don't feel like draining the entire radiator if I don't have to. So basically, would it make any difference if I install into the upper or lower line?

Kyle, when I installed mine I used the temp. test. When the car is cold start the engine, have someone put it through the gears while you feel the lines coming from the tranny. One of them should get noticeably warmer than the other.

I want to say the top line was the sending and the bottom was the return, but I'm not sure about that. :?

Its just me at the house. All my buddies are lazy butts anyway.

I'll wait for someone to reply....BILL YOU OLD FART GET ON!

No factory "external" cooler....you mean Trans cooler I think right? Either way, none here.

By what your saying I think you put the cooler in-line with the top line (return line). Boy you old people talk backwards like Yoda.

LOL

i used the test that smellbird did. You cant do it by yourself. Make sure the engine is cold, and then start it with the hood up. Press down on the brake and go through all the gears, or just put it in D for about 10 sec. Shut off the car and go to the front, putting your fingers on the metal lines that come out of the top left back side of the radiator. One should be warmer than the other. The warmer one is the line from the tranny.

if i remeber right the lower is the return

You have it installed on the top line I can see, and your saying the lower is the return line. My question to you is do you think there is an advantage to which line you put the trans cooler in? (advantages for one or the other)

Cause if its no big deal, I'm just gonna go ahead and install into the upper line (return line or not).

The top line is the return line. I know this for a fact from when i changed my trans fluid. you want it to go through the rad then the cooler for the best cooling. Hope this helps

Got the part number for the U-bend line? There'* a local GM dealer in town and I'd like to pick one up ASAP. Thanks.