Well here's my situation, the reaction shell in my trany broke, I only got first and third. I went out and bought a trany with a transfer case attached to it. This trany and tcase are out of a 99 tahoe. I'm not sure exactly what model of tahoe. But the 246 tcase is known for shiting out so I thought maybe if the 236 would work id just put it and my new 4l60e in all at once. You're input on this would be greatly appreciated. I found the hard way not to use 4wheel on concrete, but it also makes that poping sound win I'm offroading. Can u plz explain the whole reason it even does that?