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Old July 30th 08, 05:55 PM posted to rec.autos.makers.ford.mustang
Michael Johnson
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Posts: 1,039
Default Hum after rear-end gear change

wrote:
> On Jul 30, 10:51 am, Michael Johnson > wrote:
>> Take the car back and tell him to fix it. Gears don't whine when
>> properly installed. Also, after he fixes this problem find yourself a
>> new mechanic.
>>
>> 88 Mustang GT Conv. wrote:
>>
>>
>>
>>> I'm coming to all of you as the experts.
>>> I've recently had my gears changed in my 1988 5.0L convertible to
>>> 3:73:1. (I only have 152,000KM on the car) There's a humming noise
>>> which comes from the rear-end which gets significanltly louder between
>>> 60-90 KM / Hr.
>>> I was told by the mechanic that this is a common thing with the gears
>>> and should be ignored.
>>> Just wanting to get some thoughts/opinions.
>>> The mechanic I'm dealing with is great and has always done excellent
>>> work on the car. He goes over and above what I've asked him to do with
>>> little cost.
>>> I'm just thinking that it should be normal as it can become quite
>>> annoying.
>>> Thanks in advance,
>>> Marc- Hide quoted text -

>> - Show quoted text -

>
> I had 3.55 gears and trac loc put in my 69 coupe over 3 years ago. The
> entire rear end was custom built by a shop that builds ford 9" rears
> all the time for drag racing. So I know they know what they are doing.
> They test drove it. I drove it home 300 miles. I drive it maybe couple
> times a month in the summer time. Its made the whining sound ever
> since they were put in over 3 years ago. They work great. Its more
> noticable on the highway ofcourse. Im thinking that its fairly normal
> for aftermarket gears. Ive never had a problem.


I had a set of 3.55s installed in my car and have never heard a peep out
of them. This is the way it should be for an 8.8 rear, IMO. Some whine
doesn't mean impending doom but it is typically an indication that
something is off to some degree. It is easy to tell if gears are not
wearing properly by looking at the wear patterns on the teeth.
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