Thanks Greg!
It should give me a little peace of mind driving around in the future. I'm planning on taking my current 8.5 3.90 rear out this spring and dropping in an 8.5 3.08 or so rear. I want to get this GTO out on the road and take a few out of state trips this coming year,not as interested in beating up the local Mustang drivers

!
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride