Rear body mounts for a 74 k20

Hello,
I'm replacing the stock body mounts. It's been going OK so far. The first bolt has not spun on me. The problem I'm running into is how do I remove the rear bushing on a 74. Most videos suggest doing just one mount at a time but this year has this stupid metal tube/flange that would require me to lift it about 2-3" to clear the frame.

I don't think I can do it one at a time on the rears. Perhaps I can remove both rear mounts but is this bad to do with the fenders and everything still attached? It seems like a lot of stress.

Also, I'm using an electric impact to remove the bolts. Most people are using breaker bars. I honestly have less problems with the impact but would welcome advice. Hopefully I'm not going to need to cut open my floors.

First thing is loosen all four mounts, breaker bar or impact, either will work. Try not to twist any of the bolts off.
Jack up one corner at a time…it’s tough but can be done.

Old Guy Bill said:

First thing is loosen all four mounts, and I’d do it with a breaker bar. Try not to twist any of the bolts off.
Jack up one corner at a time…it’s tough but can be done.

Click to expand...

OK - well I got impatient and went ahead and just did the rear. I was able to wiggle them out with about a 1.5" lift on the cab. New rear mounts are in. It's looking more level.

I should've loosened the front mounts. I'm dreading this a little...here goes. I'll try a breaker bar on this one.

I've always done one side at a time. All left. Then all right. That way you're tilting the body side to side and not putting too much stress between cab and fender as that's exactly where the fenders rip on Blazers and burbs when you wheel them hard.