The previous owner cut the lenghts of the threaded rods in the Torklift XLs that came with my TC. Torklift gave me the correct measurement of the rod lenght, and recommended I use chain to make up the...
3/8 is huge, generally with a working load over 2000. You most likely have 3/16. Most chain I have used is 1/4 with a working load between 1200 & 1300. If you would feel more comfortable you could always go to 5/16 usually with a working load near 2000.