Remove the quad shocks with the UCAs after the TA is installed. The quad shocks are used to combat wheel hop which happens when the UCAs bind under hard acceleration. With no bind under axle twist using the T/A, there would be no need for quad shocks.
No disadvantage.. I'd go with the griggs P/H bar from www.griggsracing.com . They offer a package with the T/A Differential cover that has a fill AND drain plug. A guy I talked to at a local mustang shop that installs the MM and Griggs P/H bars says the griggs unit is stronger.. not to say the MM isn't good.. Thats just what he told me since he installs them daily.
If I were you I'd replace your LCA's before going P/H bar. I'm really happy with my MM LCA's.. spherical bushings on both sides. The weakest part of the rear suspension is the LCA's in my opinion.. So the MM LCA's and removed quadshocks really made a difference. Next thing on my list is Griggs P/H bar, but I don't plan on getting a T/A.
A guy I talked to at a local mustang shop that installs the MM and Griggs P/H bars says the griggs unit is stronger.. not to say the MM isn't good.. Thats just what he told me since he installs them daily.