Ok Yall, I've had my truck for almost a year now, and the 4x4 has never really worked. Whenever I lock it in, even on the really soft stuff, I get this horrible popping sound. I think It's most likely different axle ratios. I have a 44 front and 12B rear. I'm pretty sure I have 3.42 in the rear, and 3.73 in the front. That's what the data tag on the diff cover in the front tells me anyways. The popping sound is unbearable. Because of the necessary use of this, I screwed up my 203 and had to rechain/rebuild it. So far, I have pulled the driver's side shaft out of the 44, and it's ok. Have yet to do the pass. side. Also havent pulled the cover off yet. If anyone wants to donate a 3.73 ring and pinion for a 12 bolt, it would be much appreciated. Also, any suggestions or comments from someone who has encountered this before. Also, you can feel a knocking like movement when it happens. It stops when you put it back in 2wd and gas it or back up 50ft or so. Thanks for any replies.