I changed my NP 249 transfer case about a year ago (because of viscous coupler) with another late model NP 249 (95 T-Case 125,000 miles) and a year later it is having the same problems with the viscous coupler.
-I was wondering what causes the viscous coupler to go bad?
-Also i wanted to know if it is possible to change out the viscous coupler and not the whole T-Case?(directions)
-Any prevenative work besides keeping t-case fluid clean after i change t-case or coupler?
-Will a bad catalytic converter cause any trouble?