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Old August 1st 08, 12:29 AM posted to rec.autos.makers.ford.mustang
WindsorFox[_4_]
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Posts: 234
Default Hum after rear-end gear change

John S. wrote:
> On Jul 31, 6:54 pm, Spike > wrote:
>> On Wed, 30 Jul 2008 05:29:27 -0700 (PDT), "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

>> Similar problem. Had the differential checked as a speed shop. Not a
>> thing wrong with the unit. When they put it back together, no sound.
>> The only change was the posi lube that gets mixed in. The speed shop
>> said to only use the Ford posi lube. Have not had a bit of problem
>> since. Nice and quiet. As I recall, and I can tell you what it calls
>> for, but they used 2 tubes of the Ford posi lube.

>
> guessing you are talking about the "friction modifier"... helps the
> clutches slip when you go around corners... without it they'll chatter
> a bit..


"Whale oil" There are synthetics of that stuff now by Amsoil and
Synergyn

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