I replaced the bell housing on my 03 with a 02, now I'm stuck the cooler line fittings I have are 7/8s and the 02 is 3/4. I ordered adapters from fitzall , they make some for this reason. I get them and try to put them on the lines and my luck they don't fit. I guess GM changed there lines three time during 03. Has anyone had this issue?? I measured the lines there 16 mm even. The fittings were too small. Someone please help me out here I need to get this truck going..