2003 Jeep Liberty Renegade 4x4 3.7 V6. I have a leak in my radiator. I have the 42RLE transmission with the external transmission cooler. According to Rock Auto, the OEM model for the one I need is "MOPAR 52080120AE", but I see that there are also other manufacturers like SPECTRA, along with DENSO, Mishimoto, OSC, and ULTRA-POWER. Also, I was wondering if there are alternatives to the OEM plastic and aluminum radiator, and if it would be possible to go with an all aluminum radiator, if they even sell those, and if so, if anyone has experiences with them. Finally, I know that this system has been rusted before, I changed out the coolant and everything, but it appears that I still sprung a leak somewhere near the bottom of the radiator, I can't see exactly where. What other things should I replace since I'm already going to be in the area?