Some 4.56 gear questions!!

Dusterdude, both wheels spinning the same way is a "sure" indication that you have a suregrip. What case do you have??? If its a 489 case it is more than likely that it is the Auburn cone style unit, but of course with a 4:56 ratio somebody has obviously been in there so you may get lucky and find the Spicer clutchpak in there. Maybe sometime when you need to get in there you'll find out for sure, but for now I'd just run it as is. I think in the long run, you'll still find that the 4:56 is too tall, even for the street. My brother blu340dart had a 4:56 in his old 69 Roadrunner and it just ate the gears up driving it on the street. That car never saw a trip over 30 miles and even then, it just ate them up. They're just not made for street driving, only short blasts!!! Good luck with that Duster bro!!! By the way, did you still need that trans inspection cover?? We never got together on that!!! Geof