In my experience with the friction modifier issue,lack of it in an LSD would
cause a low speed axle "ping"not a whine on the highway.I just remmedied
this ping last week after 5000 miles without it.According to the FSM it is
only required in the "sure grip" differential.You might want to find out if
your synthetic oil already has it.Red Line does. Steve
>From: "Steve Mills" <srm804@hotmail.com>
>Reply-To: dakota-truck@dakota-truck.net
>To: dakota-truck@dakota-truck.net
>Subject: Re: DML: Gear whine?
>Date: Wed, 03 Dec 2003 14:59:17 -0500
>
>
>According to your description,you say it only whines under load,and more
>noticable at high speeds.In my experience with this it has turned out to be
>the pinion bearings.( twice in a 92)Did this place replace these bearings?
>If so, did they replace the crush collar and adjust the preload to factory
>spec? Be sure you have the old " Chrysler Clunk"or the pinion is
>overtorqued.I burned out a pair of bearings in 2 days due to a misprint in
>my FSM. Hope this helps Steve
>
>
>>From: "Josh Battles" <jbattles@bankfinancial.com>
>>Reply-To: dakota-truck@dakota-truck.net
>>To: dakota-truck-moderator@bent.twistedbits.net
>>Subject: Re: DML: Gear whine?
>>Date: Wed, 3 Dec 2003 11:06:37 -0600
>>
>>Actually... In my experience the weight of the lubricant has had not
>>effect
>>on wether the rear end makes noise or not.
>>
>>Jason, you may want to find out if the shop added the fristion modifier
>>back
>>into the differential. That could cause the noise. Do you hear it around
>>corners and while parking? It would be sort of like a howling sound.
>>
>>The reason that I bring this up is that the 3.55 unit I've got is a LSD
>>and
>>would assume that yours would be the same, now just with 3.92 gears on it.
>>I'd start there.
>>
>>--
>>- Josh
>>Lowered 2000 Dakota CC 3.9L
>>www.geocities.com/lenny187/dakota.html
>>
>>
>>"Michael Maskalans" <dml@tepidcola.com> wrote in message
>>news:2CD682BF-25AE-11D8-92CB-000A277E09C8@tepidcola.com...
>> >
>> >
>> > On Dec 3, 2003, at 7:44, Jason Bleazard wrote:
>> >
>> > > The fluid was also changed to 75w140 synthetic. Could that be
>>causing
>> > > more noise than we had before in the cold weather?
>> >
>> > I'll have to go along with Andy on this one. 75w90 is what's right
>> > AFAIK. don't know if that could cause noise or not.... getting under
>> > there and checking the oil levels might not be a bad idea, either -
>> > though you probably would have noticed any leaks.
>> > >
>> > > I'm hoping to take it over to the shop that replaced the gears, but
>> > > it's over an hour drive from here, so it isn't really convenient.
>> >
>> > could always give them a call and see if they have any thoughts on the
>> > matter, too.
>> > --
>> > Michael Maskalans '98 Dakota SLT CC 4x4 318
>> > details here: <http://mike.tepidcola.com/dak/>
>> > mobile.612.618.4652 campus.585.274.2246 fax.954.697.0487
>> >
>> >
>>
>>
>
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