Transfer case 101 needed

[Bowed]

91 Silverado K2500 with 4l80e.




There are two 1 inch plugs on the rear of the transfer case . One at the base ( drain ) and one 5 inches above the lower one , which I assume would have to be the fill plug . When I removed the top one , about two quarts of fluid poured out . Even when it reached where the fluid was level with the base of the fill hole , it would not stop trickling out . I replaced the plug and started the truck up for a minute and I could hear that gears droning . I shut it down right away and yanked the transmission stick . The transmission was down 2 1/2 quarts . I refilled and restarted and everything seemed OK .

Question 1 - both the transmission case and transfer case should be separately sealed , so how would a cross leak like this happen ?


Question 2 - If I keep the transmission is kept at the right level , Can it be driven for the time being , with out causing any damage , even with the T-case over filled ?

Thanks.