Question for 4x4 owners

[chemist]

Dumb question for all you manual 2 speed t-case owners. How much noise is normal when you're running in 4Hi?

[rlsllc]

I never noticed any sound that wasn't there in 2wd.

Why, what are you hearing?

[potskie]

Ya my truck doesn't make any extra noises except the bang of the hubs engaging when I shift it while doing more than 40.

[LiftedAWDAstro]

I don't recall the SPB ever making more noise in 4HI except that the u-joints were not parallel and would vibrate at 50 mph and higher. My truck which has a NP271 2 speed case is quiet at 50 mph in 4HI, same as in 2HI.

[BREAK]

No extra noise from my truck.

[chemist]

Thanks for the replies. The dealership couldn't find anything and just told me that it may be normal--they suggested maybe difference between manual t-case and electronic one (mine is manual). My thinking is i should train the t-case and see if the fluid has any metal in it... Anyway, at least both 4 hi and 4 lo seem to work. Just extracted a Ford Explorer from drift with a nice drop on the edge of the road...

[mdmead]

Just about every 4x4 vehicle I have ever owned makes a bit of extra noise in 4x4 mode. Not extreme, but with an extra axle and driveshaft spinning, it isn't uncommon. But it shouldn't much.