|Topic Review (Newest First)|
|05-23-2019 10:06 PM|
Originally Posted by Jhenderson View Post
|05-23-2019 10:06 PM|
|05-23-2019 10:04 PM|
|05-17-2019 09:45 PM|
|Jhenderson||Iíve got a months salary that says Iíve pulled apart more clutch type diffs than youíve ever seen. Many of them came to me because of complaints of chattering, sticking, or noisy rear ends. This comes from a lack of friction modifier, (for GM it was a type of fish oil) not a lack of lubrication. Not one of them had damaged clutch plates. After initial inspection the repair was to add the modifier, go to an empty parking lot and do tight circles in both directions under light throttle until the clutch packs freed up. Once again, no damage, just a poorly functioning limited slip.|
|05-17-2019 03:22 PM|
You have a clutch type limited slip rear differential.
You do not have any helical/torsen/magic wizardry differential.
You need to use a friction modifier or approved lubricant or clutch damage will result.
|05-17-2019 02:32 PM|
|05-17-2019 02:14 PM|
So if it is a clutch type, it may work fine without any friction modifier, and if not, then some could be added.
|05-17-2019 02:01 PM|
|Lins||If you really want to know pull the cover, the gasket is likely still the reusable type.|
|05-17-2019 01:58 PM|
|05-17-2019 01:55 PM|
|05-17-2019 12:48 PM|
|Jhenderson||Actually, my 2015 3500 calls for 75-85 . The reason for my post was in reply to concerns about Torson style diff operation with the modifier included. That being my limited slip works fine using it as well as my wife’s GTO which has clutches.|
|05-17-2019 12:36 PM|
I would suggest putting whatever 75W/140 in there that you like. Then, if it doesn't perform properly without it, add some friction modifier.
After all, there are people putting FM in open diffs and (real) lockers, and others that run clutch type diffs, which may or may not need it, without any friction modifier. And it still all seems to work fine for the most part.
Personally I wouldn't add a thing unless the diff was misbehaving, since it most likely will perform better without any additives.
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