rear differential leaking
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Some guys only add half bottle an see if that works B4 adding the whole thing and having the LS too loose..You do figure 8's and see if it chatters. If it does add 1 more oz and check...
Dick
Dick
Thread Starter
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Senior User
Joined: Feb 2007
Posts: 225
Likes: 2
Interesting......I've read a lot about NOT using the additive, but I just read a conflicting report on another forum:
Putting it in wont cause it to slip.
The only time the additive does anything is when the clutches have very little load and dissimilar wheel speeds. It does not affect lockup
When the bevelled spider and side gears load, the compression of the clutches FAR FAR outweigh the minor friction benefits of the additive
I'd run the additive, rebuilt MANY posis over the years, a couple of chatters and clutches are gone. I am not sure of the type in the PSD, havent done one yet, but having the additive wont hurt anything if you dont need it, but NOT having it will cook a clutch in no time
Its common to think the additive would hurt, but if you think about it, how could a single little bottle of additive cause such a reduction in friction that it could make a posi not work? No chemical is that slippery, all it does is prohibit clutches sticking during their designed release period
By far, my favorite kind is a small bottle from Mopar, followed by Ford or Kendall, then reluctantly everything else. Cheap stuff doesnt do much
Remember, a limited slip by design will only lock up with identical wheel speeds, so if you are trying to slide it sideways like a 4 wheeler, dont expect it to, the intent of the differential is to lock in a straight line ONLY or when wheel speeds are identical, as in the mud, etc
Putting it in wont cause it to slip.
The only time the additive does anything is when the clutches have very little load and dissimilar wheel speeds. It does not affect lockup
When the bevelled spider and side gears load, the compression of the clutches FAR FAR outweigh the minor friction benefits of the additive
I'd run the additive, rebuilt MANY posis over the years, a couple of chatters and clutches are gone. I am not sure of the type in the PSD, havent done one yet, but having the additive wont hurt anything if you dont need it, but NOT having it will cook a clutch in no time
Its common to think the additive would hurt, but if you think about it, how could a single little bottle of additive cause such a reduction in friction that it could make a posi not work? No chemical is that slippery, all it does is prohibit clutches sticking during their designed release period
By far, my favorite kind is a small bottle from Mopar, followed by Ford or Kendall, then reluctantly everything else. Cheap stuff doesnt do much
Remember, a limited slip by design will only lock up with identical wheel speeds, so if you are trying to slide it sideways like a 4 wheeler, dont expect it to, the intent of the differential is to lock in a straight line ONLY or when wheel speeds are identical, as in the mud, etc
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Its pretty simple the additive eliminates the chatter between the clutches. There are ingredients in there that make it very slippery such as a polar phosphorus and nitrogen containing chemical that modifies the coefllcient of friction of the limited slip rear axle lubricant. You should use it. I would use a brand that is spec'd for ford because gm and dana are different...
Dick
Dick
