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I'm pretty sure I know what axle I have, but I just wanted to confirm.
The tag on my axle is as follows:
WFE BA 0K16
2L75 9 S3158
I know the 2L75 9 part is right, but the rest of the numbers and letters on the first and second line are a bit hard to read, so they may not be right. The BA could be a B4, and the S3158 could be a 53158.
I read all through this forum, and on some other sites, and as far as I can tell the above code means I have a limited slip axle with a ratio of 2.75. The axle itself looks to be a 9", which I think the 9 in the above code refers to. The axle code on the door jam sticker says H3, but I haven't been able to find out if that matches the tag on the axle.
The truck is an '81 F-150, 300 I6, and a C6. And if the axle ratio is 2.75 then I'm even more amazed that the truck accelerates as fast as it does!
Anyway, I appreciate any help you can give me with this.