i just bought a posi rear and he says it ether haas 2.73 gears or 3.73....did they even make a 2.73 posi...well im puting it in thiss weekend and seeing if it changes my speed to tell...if it is a 2.73 wut is the best gear set i can get for it i heard the carrier is bigger then other ones...its a new rear bought about 6 months ago from a speed shop....thanks

 

Check the ratio before you install it. 99 44/100% sure it is a 2:73 and yes they came with a limited slip (RPO G80). Very few 3rd gen cars had a 3:73 ratio (83-85). Hell of a speed shop if they could not tell you the correct ratio.

 

What are the numbers on the ring gear, (xx:xx)? This will tell you the ratio. The 2.73 lsd would be much more common, as a 3.73 lsd was only offered for a limited number of years. If it is a 2.73 carrier, the highest numerical gear you could get would be 3.08, although you could run a spacer and higher gears.

 

Here's how to determinne what ratio the rear is (jerk the diff cover and look): numbers are stamped on the ring and pinion:

41 : 15 = 2.73
41 : 14 = 2.93
40 : 13 = 3.08
42 : 13 = 3.23
41 : 12 = 3.42
41 : 11 = 3.73

JamesC