GA Ring & Pinion Gear Sets: 12 bolt 3.73; 10 bolt 3.08

[79 silverado]

As title says, have some rear axle parts I no longer need:

3.08 ratio matched 10 bolt ring and pinion set.
The ring gear has part number 2 GM 1235126 13 40 7 89. Believe this decodes as 13/40 = 3.08 ratio manufactured in July 1989. Did not see a part number on pinion. $40 plus shipping in USPS flat-rate box

3.73 ratio matched 12 bolt ring and pinion set.
The ring gear has part number 3817778 11 41 GM 1 65 1 27. Believe this decodes as 11/41 = 3.73 ratio manufactured in January 1965. Pinion has part number 3864623 GM 2 2 65 11 44, believed to decode as 11/41 = 3.73 ratio manufactured February 1965. $50 plus shipping in USPS flat-rate box

Prices are "or best offer" and these parts are also available for local pickup east of metro Atlanta. Willing to consider trades/partial trades for something of interest for one of my trucks?