BBB is the rebuild company, not the manufacturer. If it is the manufacturer, then run. As stated use only GM parts as the junk cores and low quality seals and machinery used to tool the knock offs are a huge waste of labor $ when they die shortly after the install.
I used a GM reman rack on our 08 Denali and it was great. The only issue was the fluid. DO NOT use OEM GM fluid. They’re having issues with it causing cavitation. Use an aftermarket fluid that’s more costly because it has more conditioners in it.
Unless your talking front (differential) gear box, the rack & pinion is your steering gear box. Then Gen, with a few exceptions uses all rack & pinion steering.
Questions to ask your tech ..: Is it leaking? Does it bind? Is it noisy? Do not allow him to put in a Chinese knock off rack in your truck just because his local supply house has it or on sale as the last one at Rock Auto. BBB industries = Cangzhou Xinlida Hardware, a supplier based in China.
I sent u a message with more info.