i have a 1996 Eb 351 e4od Borg Warner and when it is in 4wd hi it is very noisy like it is in 4 low. If you crawl under the truck and spin the front drive shaft you can hear the noise and it comes from the t-case. Could Bad fluid do this? Could i need a new chain due to stretching? The t-case still works fine its just noisy as hell. The other thing if forgot to tell is its a push button 4wd.