205 issues: lube questions

[budbeater]

I had my 71 K20 out wheeling last saturday. I didn't do anything extreme, just some 4 low through a muddy desert ranch trail. I went about 4-6 miles in lo using the lowest three gears in my sm465. When I got back to "camp" I had an extremely hard time getting my transfer case out of low and getting the hubs turned back out. I pulled it forward and back several times and make sure that there was no tension on the drive line. What gives? That doesn't seem normal. It also seems like I am getting progressively more noise in 4 hi when using it to cruise 6-10 miles through snow. Ideas? I am going to start to address the issue by changing the fluid in the 205 the 465 and the front axle. Since I have only had the truck a little over a year I am still learning its issues.

What lube should I use for the NP205?

What should I use for the sm465?

Thanks

Budbeater