I have just installed new Gr-2 and they have helped out my ride issues since i have been using the stock struts and shocks on eibach lowering springs, but when i back out of my drive way the rear end of my max seems to have alot of creaking going on. Just doesnt feel solid anymore. Thought the new shocks would help but nadda! Was considering a rear strut bar. Would it help?

A rear strut bar is not gonna help in either the noise of handleing. I bet the creaking is from a lack of spring isolators or the bolts not tightend correctly.

Thanks. Tomorrow I have it in for an alignment, ill have them look at both.

In any regard, I would put the Rear Sway bar on before I put on a rear strut brace.
That would help you with handling...not with the creaking though.