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Got the 3.55's installed today. Of course I had to test it out. I put a set of 10" slicks on and gave her all she had. The guy video taping didn't have the camera on! DUH! It is very streetable now and cruises pretty smooth. I did find out why my engine was screaming for mercy before today. When I had the rear built I wanted 4.10's. The guy said they were 4.10 but I found out today they were 5.13's! He said they must have sent him the wrong gears in the wrong box, who knows. I'm ready for cruising now.
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True66GT, the Ford 9" can have gear ratios from 2.47:1 all the way up to 6.14:1. If you get a Dana 60 you can get to 7.17. 3.55s are a nice compromise, should be a nice daily driver