Is the z32 diff 5 bolt, i need a 4.08 for my car bc the one i have now i 5 mph off and when im doin 45 im really doin 50, dont know what rear end it is but need to figure it out, my gears are really long and when i go though 2nd, it is at almost 77-80 mph. My car also makes more than 500 whp. Been trying to figure it out for a while but havent had time.