Cadillac CTS First Generation Forum - 2003 - 2007
I tried a search and didn't find much.
Car has been great, I have 145K on it so far.... I have dropped it with FE4's from a V (with springs), and I swapped rear diff fluid with 75W140 RP.
It began making a groaning noise starting about 45MPH. It hasn't really gotten much worse, but I thought...