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View Poll Results: What brand of Gear Oil are you using?
Amsoil 2 4.17%
Amsoil Synthetic 2 4.17%
Mobil 1 6 12.50%
Royal Purple 5 10.42%
Lucas 4 8.33%
Lucas Synthetic 6 12.50%
Valvoline 13 27.08%
Mopar 2 4.17%
What ever the shop uses 2 4.17%
House Brand 1 2.08%
What ever is on sale 2 4.17%
Other (Specify in post) 3 6.25%
Voters: 48. You may not vote on this poll

Gear Oil

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  #1  
Old 11-14-2009, 11:06 PM
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Default Gear Oil

What brand are you running? Do you like it? What weight do you prefer?
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  #2  
Old 11-15-2009, 02:27 AM
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super tech full synthetic. 75w90 front and 75w140 rear.
its going to be rotella 80w90 front and rear after the gear change.

do i like it? how would i tell, gear oil is gear oil. if the gears aren't overheating and chattering (or grenading) then i guess its good.
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Old 11-15-2009, 03:49 AM
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In my truck I'm using regular Valvoline since the No-Slip doesn't like synthetic. I use Amsoil on my B2 since there's a lot of money in the diffs.

BTW all Amsoil is synthetic so both Amsoil choices are redundant.
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Old 11-15-2009, 07:15 AM
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I use the Lucus Synthetic 80W90
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Old 02-17-2010, 11:28 PM
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valvoline 90w
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  #6  
Old 02-18-2010, 05:11 PM
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Royal Purple 75W-90 Synthetic. I bought it 3 years ago when RP gear oil was $10 a quart. Now its something crazy like $17 a quart. My advice here is dont buy it! It does the same thing as any other fluid in the $5-$10/quart range.

Next change I'm going with Mobil 1 or Valvoline Synpower fluid that has a reasonable price.
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Old 02-22-2010, 02:27 PM
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Well, im going to change out my rear end fluid.

There are many choices
I have the Chrysler 9.25 with trac lock (limited slip) Which means i need to add the hypoid friction modifier right? It has 165,000 miles on it. And im not sure if its been touched...

Ive been running some choices threw my head. From the factory my rear came with 75w90.

I can use Royal Purple synthetic which it says it has the friction modifier in it and theres no need to add any. Or i can use Valvoline synpower(Has the modifier), Mobile 1 synthetic (Has the modifier), Or valvoline (not synthetic) gear oil wich states it can be used in limited slip diffs also.

Now, should i go with 75w90? What do you guys reccomend? Should i go with Non synthetic or synthetic? Is synthetic really ok for limited slips? And is it ok to use it with my mileage?

Also, should i trust when they say that there gear oil is safe to use in limited slips and not add any friction modifier to it?

Any help at all will be greatly appreciated.
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Old 02-22-2010, 07:29 PM
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I have Valvoline Synpower 75w-140 in my truck, before changing fluid only both wheels would lock up while power braking now on a constant basis they lock up, part of this has to do with my truck being a 96' and the clutches are worn, thinking about adding some friction modifier just to see if it does anything. Valvoline says its not needed
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Old 02-22-2010, 11:22 PM
DODGEPWR DODGEPWR is offline
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I did some searching and mobile 1 synthetic is not a good choice for an LSD. (FYI) You have to add a butt load of friction modifier for it to work right..And then you still may have chatter and grabbing issues..

Ive decided im going with good ol regular 80w90 Valvoline High performance and a tube of friction modifier. That should do it problem free.

When i do this i know the fill plug is a rubber plug on the rear cover. I wanna replace this plug with a new one. Anyone know where i can get it? Got a part #? Or is it just a generic part that i can find on the shelves at an auto parts store in the misc stuff?
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Old 03-20-2010, 01:53 AM
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I am going to be adding 100% of the lucas oil additive in my diffs. It says it can be used from 50-100% and no need for limited slip additive (since there is anti foam already added to the lucas oil additive).

It is the Lucas oil "oil stabilizer"
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Old 03-20-2010, 01:53 AM
 
 
 
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