well i can tell you this with my rx7 since it has a working speedo and i have 4.11 gears in 6th gear i can do 70 @1800 rpms in the chevelle i have not taken it out on the highway yet so i dont know..lol i ordered a drive shaft that was 50.5 inches long which fit perfect for my t56 and 12 bolt rear. my gearing is the following
2.66, 1.78, 1.30, 1.00, .74, .50
the tunnel you have to cut it and raise it about an inch and a half. I did that and it sits perfectly
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2005 dodge magnum daily driver
1988 mazda rx7 LS6 swap
1969 SS work in progress
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