Advice on purchasing a 5 ton

[Blazer1987]

Hi, im looking at a m931a2. I spoke with the owner and he said he thinks the transfer case is making noise. I asked about the noise. He said it sounded like a loose chain in the transfer case,but he was not sure. Is the transfer case chain drive? The owner has been driving it for 2 years and the noise has not got any worse or better. If the transfer case was making noise wouldnt it blow up after years of driving? Do these trucks have a common transfer case problems? I thought they are gear drive cases? Maybe it could be just something else loose or rattling? Thank you.

 

[Coffey1]

They blow up in reverse low.

 

[wreckerman893]

I replaced the transfer case in an M925 only to discover that the noise was actually coming from the front differential.
Noises are hard to pinpoint sometimes.

 

[swbradley1]

They blow up in reverse low.

I believe you meant to say they blow up (crack the case) in reverse low when under a load. Just putting the truck in reverse low and backing around the yard won't blow it up.


But it never hurts to be safe.

 

[Scar59]

Front drive shaft carrier bearing makes the "rattling chain" sound. They can last a long time making noise. I had the same problem. Take the front drive hubs off and take it for a spin. This will keep the shaft/bearing stationary.