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  #17  
Old July 31st 08, 08:02 PM posted to rec.autos.makers.ford.mustang
John S.[_1_]
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Posts: 221
Default Hum after rear-end gear change

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..
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