Re: D20 Question
Those threaded holes are for switches to light a light to tell you when you're in 4 wheel drive, low range, etc. Most Jeeps didn't have this option so the factory put in the little plastic plugs. make sure when you put them in you use a DAB of sealer around them or water and mud will seep in around them into your transfer case. International wasn't as cheap and on their 20 transfer cases that didn't have the option they used a threaded steel plug. The detent springs and balls are actually on the other side of the shift rail. If you look close at the casting you can usually see the bulge on the outside where these are at. Good luck. Nickmil.