There are several different gear ratio's and some have lsd rearends and others are open(no lsd, no posi). The way you tell is by the code that is on the tag in the drvers door jam. Look at the code that begins with G.
It should be something like G305.
The G is for the diff size so G=8inch diff(all Supras have the 8inch)
The 1st two numbers are the ratio.
They are as follows.
28=4.3
30=3.9
31=3.7
The last number tells if it is open or lsd. If it is an odd number it is lsd, if it is even, it is open.
So G305 is an 8 inch rearend housing with 3.9 gear ratio and is lsd.
Hope this answers your question. I have never heard of a Supra with a true posi in it, would take away from the cars cornering ability to much. There might be more ratio's but these are all I know of.
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