Yup, I saw that and it helped greatly, but again, 051 was not on it.

I guess I will just post what I have collected on this specific thread to help the next person or if anyone wants to bookmark, that works too.

Also, if anyone would like to correct me here, please do, I have gathered bits and pieces here and there but could have very easily missed something.

KEYWORDS = LYNCH ROAD RD Rd rd fender tag codes

SG/Dana Differential Codes
'69 - 586(3.23SG), 591(3.55SG), 592(3.23SG), 594(3.55SG), 596(3.54DANA), 597(3.54SG), 642(3.91SG), 643(3.91SG), 644(4.10DANA), 999(A12-4.10DANA)
'70 - 052(3.55SG), 053(3.23SG), 055(3.55SG), 056(3.23SG), 057(3.91SG), 058(3.91SG), 082(3.54DANA), 083(3.54DANA), 084(4.10DANA)
'71 - 043(3.23SG), 045(3.23SG), 046(3.55SG), 047(3.55SG), 048(3.91SG), 050(3.54DANA), 051(3.54DANA), 052(4.10DANA)

Big Block Engine/Transmission Codes
'70 - 112 426 8-bbl (Four Speed), 113 426 8-bbl (Automatic), 114 440 4-bbl (Four Speed), 115 440 4-bbl (Automatic), 122 440 6-bbl (Four Speed), 123 440 6-bbl (Automatic).

One of the sites I listed has a blank tag where you put your info in and supposedly decodes it.
But yeah, most won't help directly, but the OP will learn things.
(That's not a snide remark - I've been at this stuff since the '60s, and I learn things all the time)

Thank you John.

In my opinion, Galen can no sooner get you for copyright infringement for typing:

"051 = B body 8.75 , 3.23 single track 10" brakes , the 10" brakes tell you it has front power disc brakes"

Than Chrysler could sue him for deciphering what 051 means on a fender tag.

I could be wrong though. But in any event, just posting what the numbers mean does not seem like a copyright issue. Now if you were to scan the pages from his book directly, yeah, that could be a problem.