The common upgrade some folks here will give you (including myself) is to upgrade axle to a 14 bolt 9.5" 6 lug. Those came in the 2500 "light duty" version that had 6 lug wheels. It's a stronger axle and has better brakes. And those usually had 3.73 gears, so good axle for towing and improved acceleration.
Swap is super easy on a 4x4 1500 because it already has 6 lugs. Rear axle is a direct swap, just need conversion u joint and new u-bolts.
On the 2wd, you'll need to swap the front spindles/rotors/calipers to convert to 6 lug all around, in addition to rear axle.
My brother did this swap on his 90 C1500. Donor was a C2500 LD from 96 or so.
His old axle had 3.08 open differential. His swapped axle had 3.73/G80. The G80 on the heavier axles seem less problematic in my observations.
He spent around $400 in all, and has mentioned it was the best swap on a "happy face-to-dollar" ratio, if you know what I mean.
He's got the only 6 lug C1500 I've seen locally, LOL.