A post about transmissions brought up something I remembered a long time ago. In our area next to the mountains it is pretty common to have to spend 3-4 hours in low range climbing up the side of some big steep hill. Back in 71 when I bought my jeep the fad was to replace the rear open bearing in the transmission with a sealed one to keep the transmission oil from draining back into the transfer case when going up a long steep hill or the other way around when going down hill a long time. Everybody did it including me (T-14) soon after bought it. Also seems like we had to plug a couple of small holes also. Please keep in mind this was 47 years ago, so my memory it not that great. Heck I have a hard time remembering what I had for breakfast this morning. Anyhow I have never heard anybody talk about doing this on the forum. Never had any transmission problem and that bearing is still there. So don't know if it helped or not. Anybody have any thoughts about this? At the time it seemed like a pretty good idea and like I said everybody around here was doing it.