I've got a 88 Chevy Silverado that I am in the process of turning into a street legal pulling truck. I will eventually be powering it with a 364 CI DART SBC (680 HP and 540 l/ft of torque). I'm looking at the front & rear diff's thinking about what gear ratio I want to run. Tires are 33". Tranny is currently a 700R4 with a 241 transfer. I will be putting in a TH400 and a 205 at some point. Front axle is a 8.25 IFS. I will run that until I swap it out for a Dana 60 King pin and the rear will be a Corp 8 bolt lug. Would be interested in what others are doing.