op says wrote:
I will crawl under the truck today and get the identifying marks to confirm if this is true to paper versions and let you guys know.
Knowing and arguing over the rear axle brand isn't going to help your situation.
The issues isn't rear axle brand but rather those two OEM 3150 lb rated tires on the trucks rear axle ain't going to carry a TC that size.
Your crew cab short bed 158" wheel base trucks front axle will carry little if any weight. Some TC folks depending on the TC size have reported loosing a bit of front axle weight so the tires on the front axle don't come to play.