http://www.quad4x4.com/syntorqlt.html     So since I know I got to put some sort of lubricant back into the transmission and NV4500 fluid by Castrol is no longer produced. So I called the shop that is rebuilding my transmission. He suggested 50 weight synthetic transmission fluid in a GL-4 rating.  So I started digging around. I can buy a 5 gallon bucket locally for 50WT Synthetic GL-4 Transmission Fluid. Then did some digging on the Internet because I want to find out if any ot