m factory 3.08's in mine this week, to 3.42 posi, and it was night and day on my 87
thats the truth.. i had big tires and 2.73 gears.. and it wouldnt get out of its own way.. swapped to 3.42s and it moves right along.. gear ratio swaps make all the difference in the world. if your looking for speed, id try to find a 3.73