Running rough in 4wd

[89poohbear]

I have an 89 Blazer.

When I put it in 4wd, it pulls to the right pretty hard. Also, I hear what sounds like metal grinding when 4wd is engaged. I

've replaced the locking hubs with no affect. I have limited mechanical ability, but the trucks not a daily driver right now so I have time on my side.

Any suggestions?

 

[Hogback Fabrication]

Check your axle u-joints.

 

[nad]

Like while you're in 4-wheel drive or when you're engaging it? Mine grinds really bad taking it in and out of 4-wheel, but I think that's because my NP-208, being chain driven, is just made like that.

 

[slyguy_22]

if its pulling one way or the other i would assume you mean while in 4x4 and that it grinds as well. If thats the case remove your front diff cover and look for metal chunks. sounds like you spun an axle or knocked some teeth off the ring gear. you can look at each side and see the u joints on each axle. look at them first before you check your rear.