Decode My Tag

[RacerJames]

I have an 88 5.0 hatch. Decided this morning to install the 5 lug axles I've had lying around. After 5 hours and cursing one broken pin bolt, it is done.
The rear end tag says it's a 2:73 limited slip, which I verified. Thing is, I don't know enough to decode the rest of the tag.
S201A
2L73 88 8B22
is this an 8.8 or 7.5?

 

[oldskolbus]

I got a decoder guide but it decodes your door tag/could be on B pillar. On the bottom of the tag, 2nd in from the right there should be a letter or #. It says Ax above this letter. If its a factory 5.0 it should be a 8.8.