727 build fail

As Cudafacthackjob said the rear clearance shouldn't do that in forward gears. If it's not trying to pull in neutral the rear clearance is ok. If it is pulling a slight amount in neutral it'll probably wear in in a few hundred miles and stop doing it. I'm not exactly clear on when it's happening to you so if you could go out on a road where the traffic is low (or none) and stop and run it though each gear and explain exactly when it's happening (such as on the 1-2 shift or the 2-3 shift or only when it downshifts to 2 or 1) I might be able to help more.