Guys, I've got a '99 GMC Suburban. 350, auto, 4wd, 3.73 limited-slip rear, and push-button 4wd. The transfer case on the truck is cracked significantly, and it won't hold oil. As such, I'm looking for a replacement transfer case. My question is, which transfer cases will work? Based on the numbers, I'm coming up with a NP 246 model. The build codes in the glove box show NP8. The information on the transfer case reads: 246 GM 1501 7912 NP8 Serial # 219983 Ratio 272 Does the push-button 4wd matter at all? Can I just find any NP246 out of a GM truck, and bolt that puppy in? Any assistance would be most appreciated.