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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1588237" data-attributes="member: 30520">Another vote for FRPP gears. As for the driveshaft, it's a nice-to-do but you likely won't notice a thing.  From a mechanical standpoint, the larger diameter shaft will change the RPM in which shaft critical speed occurs, which should result in a smoother drive.  The critical speed occurs at an RPM that is now no longer practical.  This is generally what the dogbone dampener was meant to help with.  But vast majority of folks swapping a shaft don't notice a thing, and some have clearance issues with the larger diameter shaft if their car is lowered.  I've seen them rub on mufflers or parking brake cables.  I have an Al shaft on my fox, but stocker on my SN95.   I do have a vibration at 80MPH that i always wondered was shaft related as changing my trans mount helped, but didn't cure it 100%</blockquote>