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JBDISCOVERY · 10-07-2011, 06:53 PM

Question to all:
How is a differential whine corrected? Have a whine at 50 to 60 mph. Seems to respond to changes in the throttle. But also the turbo maybe causing the whine. Thoughts please.
JB

Skip426 · 10-07-2011, 10:17 PM

Short of replacing the gear set there is not much to be done, take an oil sample and have it analized , that can help determine if it's the diff. making the noise.
But before you go that route; while driving, take carefull note of the RPMs of the motor and the gear the trans is in. If your in fifth gear ; for example; when the noise is most evident, then slow down, shift the trans into forth, and operate the motor through the same RPM range. If the noise appears to be the same. Then it is quite likely turbo related.
A few questions, is this a new noise , or are you new to the coach?
What engine , trans combination are you running ? Any recent changes to the coach; IE. muffler? air filter ? Tires? . The reason I ask , is that many people who change to a K&N style air filter hear a whole bunch more engine noise than they did with a stock air filter.

JBDISCOVERY · 10-08-2011, 10:03 AM

Skip426
Thanks for the reply. The coach is a 99 Discovery with currently 87,000 miles. We have owned since 2004 and have put 55,000 miles on. The whine is not new. Will try your suggestions and see what happens. Will share the results.
Regards.
JB

Gary - K7GLD · 10-08-2011, 10:41 AM

Quote:

Originally Posted by JBDISCOVERY

Skip426
Thanks for the reply. The coach is a 99 Discovery with currently 87,000 miles. We have owned since 2004 and have put 55,000 miles on. The whine is not new. Will try your suggestions and see what happens. Will share the results.
Regards.
JB

Some differentials will have a whine right out of the box, and as long as it remains at the same level, usually not an eventual failure issue - just an annoyance.

Some good differential service men can carefully adjust the ring gear to pinion adjustment, but it takes a good one to do it - and MIGHT create an actual wear issue if the differential then has to seat in to a new operating position. And for the record, most differentials have a natural resonance point that is engineered to come in and pass thru at around 45-50 mph, since that is a speed few vehicles spend significant time operating.

The differential in our '88 Winnie has a slight whine too - but it has remained at a constant level, and doesn't seem to be a potential issue - and is barely percepible anyway, so no worries...

JBDISCOVERY · 10-09-2011, 07:08 PM

Fellows:
I did the testing with running in different gears and the whine was still there. Did not change with the RPM change. Will have to just get used to it. I like to run between 50 to 60mph. On I-5 today, about 60mph the whine went away. Thanks for the help. This is what IRV2 is all about.
Regards
JB