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Question for 4x4 owners
Posted: Mon Dec 28, 2009 1:10 pm
by chemist
Dumb question for all you manual 2 speed t-case owners. How much noise is normal when you're running in 4Hi?
Re: Question for 4x4 owners
Posted: Mon Dec 28, 2009 3:23 pm
by rlsllc
I never noticed any sound that wasn't there in 2wd.
Why, what are you hearing?
Re: Question for 4x4 owners
Posted: Mon Dec 28, 2009 7:30 pm
by 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.
Re: Question for 4x4 owners
Posted: Tue Dec 29, 2009 5:11 am
by 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.
Re: Question for 4x4 owners
Posted: Wed Dec 30, 2009 8:52 pm
by BREAK
No extra noise from my truck.
Re: Question for 4x4 owners
Posted: Sat Jan 02, 2010 8:24 pm
by 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...
Re: Question for 4x4 owners
Posted: Sat Jan 02, 2010 8:28 pm
by 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.