auto 12ht drivetrain noise

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Sep 28, 2002
Kamloops, BC Canada
OK, I will run this problem from the start.

The truck came back because of worn u joints, we replaced them and sent it on its way, then it came back for pulsating brakes, we fixed it.

Now it has a deep wow wow wow around 60 to 70 mph, when you take your foot off the accelerator pedal it goes away, we even went so far to swap out the ring and pinion gear, swapped in different drive shaft and the sound is still their.

Also too mention in third gear at the same speed the noise is not their only when you shift it into overdrive???

Did another test, put in low range and it did exactly the same thing in overdrive at the same rpm, but at 30MPH.
R&P to me .. t-case bearing or gear set ..

Thanks Topage, only thing we have not changed out is tcase, guess thats next on the list, R&P changed out, drive shaft changed out.

List is getting shorter.

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