My wife has a 05 yukon denali with the 6.0l, the oil pressure has been running really low but truck was running fine. I replaced the oil pressure sensor about 2 years ago and I thought that was the issue. I replaced it again and still ran fine. 2 nights ago it stalled out on her and she got it running again but limped it home. Now I can hear the clanking in the front so figured the oil pump is bad. Got everything needed start taking it apart and spent 6 freaking hours trying to get the harmonic balancer/crank bolt out and CAN NOT GET IT TO BUDGE. I've heated it, I've used my impact on it, I've used my breaker bar with a cheater pipe and nothing. I even tried bumping the engine over with the bar on it and still nothing. I'm at a freaking loss here. Can anyone please give me a way to get this damn thing out. I've exhausted everything I know other than swapping the entire damn engine. Thank you in advance for any and all help.