Limited slip additive

[Jeff_in_Atl]

Question.
When I go to the store looking for rear end lube, they have 2 types. 1 for non limited slip rear ends and 1 for limited slip rear ends. What is the difference in them? Does the one for limited slip rear ends already have the additive in them? The bottle doesn't say. If the one for limited slip rear ends already has it in it, adding it will make it slip more and not turn both tires.

[Kevin - Blown 95 TA]

The limited slip additive is a friction modifier. It makes the clutches grab even though they are covered with oil. It is similar to automatic tranny fluid when you rub it between your finger & thumb & it feels grabby. If you added a bottle of the GM additive to lube that already has it in there, it won't hurt anything.

[Jeff_in_Atl]

I thought it was to make it slip to keep it from grabbing all the time. Without it, the rear end tries to not slip when cornering and wears out the clutches.

Never-the-less, my question is whether the stuff from the store has it in it or not.

[wolfdogs]

Originally posted by Jeff 95 Z28
I thought it was to make it slip to keep it from grabbing all the time. Without it, the rear end tries to not slip when cornering and wears out the clutches.

Never-the-less, my question is whether the stuff from the store has it in it or not.

no. it does not. even though Mobil 1 gear oil is "said" to not need it......dont go home without it. its cheap insurance. i always run it after changing the gears and changing the fluid.

[BAS]

Re: Limited slip additive

Just get some Mobil 1 75w90 or something.

If you have a limited slip rear end,
goto the dealer and purchase a
bottle of the additive.

Originally posted by Jeff 95 Z28
Question.
When I go to the store looking for rear end lube, they have 2 types. 1 for non limited slip rear ends and 1 for limited slip rear ends. What is the difference in them? Does the one for limited slip rear ends already have the additive in them? The bottle doesn't say. If the one for limited slip rear ends already has it in it, adding it will make it slip more and not turn both tires.

[Rob]

If you run Mobil 1, you don't need it. The additive is purely cosmetic. The chattering is more of annoyance, that's why you put it in. It doesn't hurt the differential.

For a performance car, it hurts it. It causes slip, which you don't want. Go to the track and look at all the one wheel burnouts. You'll find that most, if not all, run the additive.

If it chatters with synthetic, then just change the fluid. Should change it every year anyway.

[BAS]

I had regular lube in. It was MORE than an annoyance. It soudned like the rear
was going to grenade.

"Boing!!" and other such sounds
were heard next to the chatter in
the turns.

Originally posted by Rob
If you run Mobil 1, you don't need it. The additive is purely cosmetic. The chattering is more of annoyance, that's why you put it in. It doesn't hurt the differential.

For a performance car, it hurts it. It causes slip, which you don't want. Go to the track and look at all the one wheel burnouts. You'll find that most, if not all, run the additive.

If it chatters with synthetic, then just change the fluid. Should change it every year anyway.

[Jeff_in_Atl]

It looks like there is a lot of confusion on this issue.

[BAS]

Originally posted by Jeff 95 Z28
It looks like there is a lot of confusion on this issue.

follow whats in your owners manual.

[Kevin - Blown 95 TA]

No big mystery. If you get Redline lube, it has the stuff in it. Most others do not. Get a bottle of the Gm stuff and put it in there along with the Mobil 1, Valvoline, Pennzoil, or whatever during the change. That's all you need. In my case, I use 80-90 and 2 bottles of additive. When I had the 10 bolt and stock cone type diff, I used 1 bottle of the stuff. Change it when you feel guilty, and life will be beautiful.