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Driveline or tire noise on used truck?

1.1K views 4 replies 3 participants last post by  Commander112  
#1 ·
Here is the situation, I am looking for an inexpensive QC 4x4 to keep as a winter sled among other things and have found a '02 1500 GC 4x4 slt with 101,000 miles on the clock and the 4.7. I have owned an 05 Ram with the hemi and also a Dakota and Grand with the 4.7. None of these vehicles have failed me over the years that I owned them but none of them had this kind of miles either. Anyway, this truck makes a lot of noise when running down the road and I cannot tell whether it is coming from the tires or the driveline. So what I did was while rolling down the road at about 50 mph I put the truck in neutral and threw the transfer case in neutral also. The noise is still there. To me that means it has to be tire noise. Does this logic make sense or can it still be from the driveline?
Also, on vehicles with the manual transfer case is it common to have a bit of grind going from neutral to 2 hi? I think my 05 did this also but cannot remember. If you throw the lever with authority no grind but if you just limp wrist it it will grind a bit.
I'm a little spooked by these issues plus the selling dealer wanted to point out that the truck has no warranty. He even said "if the trans fails right after you leave here you have no recourse" as an example.
The truck seems priced right though at about $1000 above Galves wholesale and well below KBB retail good condition value by over $3000. Thoughts please...
 
#2 ·
Tire noise you can hear building in intentisty as you increase speed, I'd say becoming more noticable as you get past 40mph. It also usually sound like it's coming from outside the vehicle.

Driveline noise, is something you can sometimes manipulate with the throtrtle while at crusing speed. The noise becomes louder as you apply the throttle, and goes quite as you back off. In these cases, it's usually a seal/bearing on a transfer case output shaft, or at a differential input. This noises tends to sound like it's coming from right under ya.

The differentials can also whine, but I have heard this kind of noise for a long time.

If you can describe the sound you are hearing with great detail, perhaps someone could help target the cause.
 
#3 ·
Thanks for your comments and they make perfect sense to me. The noise I am getting does pick up in intensity north of 40mph and as you describe, I am not getting any noises when on or off the gas at slower speeds. The more I think about it the more this seems to be coming from either the tires or the outer corners of the vehicle. Thanks again.

Mark
 
#4 ·
Tire noise should go away if you drive on a snow covered road or a dirt road.
You shouldn't get any tire noise if the truck is on a lift or jack stands running in gear.

I knew I needed a bearing somewhere when I had a noise while driving on dirt roads and running the truck in gear on jack stands. I took it to the dealer and they ran it in gear on the lift and said it was a pinion bearing. After the new bearing installed, the noise was gone.
 
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