I know this is Duramax Forum, but I'm currently working on my sister's 97 7.3 PowerStroke. It has an oil leak on the top of the engine and I'm thinking it's the oil supplu line to the turbo. I just can't get the (4) 1/2 in hex bolts out of the base plate. The rest is a piece of cake. I was thinking about a 3/8in drive impact wrench I'm so desperate. Not enough room for a cheater bar on the breakerbar. My air ratchet won't budge it.