2.76 to 3.91's SG
if its a 489 case it will have a cone type limited slip if factory if its a 741 or 742 it will be a clutch type some people call the 742 the stronger case even though the 489 has the bigger pinion stem the strength between the two has been argued if you are concerned about the swap the 741 742 and 489 all will swap into a 8 3/4 housing as for identification all you do is look at the last number of the line of numbers below the pinion if you do get a 489 id spend the money on the solid sleeve kit they make to remove the crush sleeve
here is an example of a 741 case
quick note i have read some where the 489 has a big 9 on the side and the 741 has a big x on the side and the 742 has a 2 on the side of it
also dont dissregard the 742 its just as much a power house as the 489 on that note i have seen some pretty nasty cars run 741
if its a 489 case it will have a cone type limited slip if factory if its a 741 or 742 it will be a clutch type some people call the 742 the stronger case even though the 489 has the bigger pinion stem the strength between the two has been argued if you are concerned about the swap the 741 742 and 489 all will swap into a 8 3/4 housing as for identification all you do is look at the last number of the line of numbers below the pinion if you do get a 489 id spend the money on the solid sleeve kit they make to remove the crush sleeve
here is an example of a 741 case
quick note i have read some where the 489 has a big 9 on the side and the 741 has a big x on the side and the 742 has a 2 on the side of it
also dont dissregard the 742 its just as much a power house as the 489 on that note i have seen some pretty nasty cars run 741