FYI........
I have the Roush 3rd Link in hand now & I see what Roush did to improve this part.
1st off, this is the OEM 05-09 UCA arm\mount assembly that Roush modified by removing the OEM 05-09 UCA bushing\retainer section from the UCA then welded on a metal sleeve w\ reinforcement welded to the OEM UCA that is sized to allow the use of the 05-09 OEM UCA diff bushing rotated in it to align the articulation slots to allow the UCA to deflect laterally in conjunction to the UCA rear axle diff bushing's vertical deflection during articulation but since the OEM rear UCA diff bushing is much smaller (most likely better durometer rubber materials as well) in dia as opposed to the OEM front UCA bushing it naturally reduces deflection movement (pinion rise) under load more thus you get a 2-fer.....less deflection for improved wheel hop control (but allow just enough deflection to better maintain tire grip under acceleration---not shock the tires as Billy laid out) while allowing full axle UCA articulation movement to help maintain the rear wheel contact to the road surface thru body roll while turning to improve cornering performance\control.
After seeing this for real I am very confident this is gonna improve my setup quite well by reducing the last part of axle articulation resistance on my rear axle's suspension (the front poly bushing in the 05-09 BMR adj UCA) along w\ the addition of the Eaton Tru-Trac diff's 3.5 TBR should improve overall handling for mostly spirited street use. This also may well have another improving effect......reducing rear axle resonance transfer into unibody (w\ this part all rear axle bushings attachments to unibody will be OEM Ford design......both LCA's are OEM 13-14 GT500 so better bushing materials than OEM 05-09, UCA diff bushing is OEM 13-14 GT500 so better bushing materials & inner core sleeve design than OEM 05-09).
I'll find out very soon.
Since this part is using the OEM 05-09 rear UCA diff bushing in the Roush modified UCA, this can also be upgraded in the future to use the OEM 13-14 GT500 rear UCA diff bushing which is much better materials\design but retains all the axle articulation......that is if it is desired\needed.
I do have 1 question for Billy:
I see that this part comes w\ the front UCA bushing already set in mounting bracket & assumed torqued to 129 ft\lbs (nut is align-marked to bolt by Roush) so is this set by Roush to coincide w\ their spring package's S197 ride height or is this set to coincide w\ the OEM 05-09 S197 spring package's ride height? I ask as from my read 1 should break this bolt loose when installing then load the axle & torque both front\axle bushing bolts to 129 ft\lbs to ensure both front\axle bushings are in the neutral position to coincide w\ the car's ride height it is being installed on.......or am I over thinking this?
To me it makes sense to loosen\retorque it along w\ the axle bushing under load...........
Not worried about it either way as I'm not gonna return it & if I do loosen\retighten it it's gonna be done properly anyway (Roush is using the OEM 05-09 FoMoCo UCA mounting hardware) so no issue but am curious so want to know just to know......
PS--Never mind.......just downloaded the Roush instructions & read them.