yes you can run 275s in the rear, I know many people who have lowered 67s and 68s and still run 275s, you just have to get the backspacing dead on But there are not many things you can do wrong when installing springs to make the car lower, lots you can do wrong to make the car higher So as long as you got the locater pins in the rear end correctly, this would just move the rear front or backwards I think you need to call Eaton and make sure you got the correct springs
Banshee, sorry about that, but this is the Tech Help forum I think we should be helping not just saying they are doing it wrong
