Well this weekend Im getting ready to swap the rear end in the LS. Getting a 3.42 rear from a 40k mile 84' MCSS for $125 in Beaver Dam on Saturday and swapping it the same day, if goes as planned. Got the correct speedo gear, tranny fluid/gaskets(doubling them up) and new rear gasket, fluid. Not expecting a huge difference in performance(has 3.08's) but hopefully a little more without the expense of much mileage .