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Limited Slip Additive #5162335 07/16/19 09:39 AM
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Snagglefoot Offline OP
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Here is a limited slip additive readily available in Canada at Canadian Tire. I’m trying to find out out how much to add and so far I hear about two to three oz per quart. Anyone have some guidelines on that? I left a message with CRC since there is no suggested dosage. And yes, I know there are some diff fluids that already have some mixed in. My application is a 14 Bolt 10-1/2 inch LS Chev diff. smile

B6721B61-AE9F-4A99-ADB7-9486A46CE978.jpeg95F2068B-8976-4113-BD61-65AD392940D3.jpeg97C20BB0-A138-4F12-A0CA-E8A3BC0D2D48.jpeg
Last edited by Snagglefoot; 07/16/19 09:39 AM.

If you want the job done right......do it yourself.
Re: Limited Slip Additive [Re: Snagglefoot] #5162354 07/16/19 09:59 AM
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MolaKule Offline
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For clutch type posi's my experience and recommendation is to add 1/4 tube and then do circle 8's in a parking lot. If chatter still exits, then add another 1/4 tube until it stops.

In my view most people over treat with this stuff and then when torque bias is needed the clutch slips.


Dr. Larry Fleinhardt: "You know, that term "dark matter" has always perplexed me. It fallaciously implies that the 95% of our universe that cannot be observed is some amorphous, eventless emptiness."
Amita Ramanujan: "I'm sorry?"
Dr. Larry Fleinhardt: "I guess it's all too human. Instead of admitting to the present limits of our knowledge, we just declare things to be unknowable." NUMB3RS
Re: Limited Slip Additive [Re: Snagglefoot] #5162366 07/16/19 10:05 AM
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Snagglefoot Offline OP
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Thanks, this tube is 7 oz, so a quarter would be almost 2 oz for the 3 quarts in my case.

Last edited by Snagglefoot; 07/16/19 10:21 AM.

If you want the job done right......do it yourself.
Re: Limited Slip Additive [Re: Snagglefoot] #5162429 07/16/19 11:20 AM
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Donald Offline
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In the past I have bought OEM additive and went with what was on the Amsoil website.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Limited Slip Additive [Re: Snagglefoot] #5162473 07/16/19 12:16 PM
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69GTX Offline
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2-6 oz should normally be enough to get it done. 3-4 oz is probably the norm. Most mechanics will just dump the entire tube in.


----------------

2001 Lincoln Cont 4.6L DOHC/ 50K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: Limited Slip Additive [Re: Snagglefoot] #5162489 07/16/19 12:31 PM
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propuckstopper Offline
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I have always been confused on this issue as well. I have aftermarket posi units in both of the old GTOs. One is an Auburn, and one is an Eaton. Each of them are about five years old, as both rear ends were gone through completely at that time. The reason for the aftermarket posi units is because the factory Pontiac cone-style posi units are not really rebuildable. One guy claims he can do them, but it is not a popular choice among those in the know.

Anyway, I am using dino-based gear oil in both rear ends with Ford (!!!) posi additive as per the recommendation of Eaton. I always wanted to try Amsoil Severe Gear as Amsoil claims to have the posi additive already built in. Yet, they too sell a posi additive.

The truth is, these cars see very little miles and very little tire spinning activity, so I have never really determined if these posi units work "right". There is no clunking in the turns, so I know I am good there. I think the Severe Gear is likely a superior fluid than what I am using, but with these cars seeing about 500 miles per year I can't really justify the use of synthetics. It is not a cost thing, but I can't imagine any of these rear ends failing any time soon given the mild usage and limited miles.

Similarly, I use a dino-based gear oil (Sta-Lube GL-4) in the Muncie 4 speed. The "rumor" out there is that synthetic gear oil does not have the correct coefficient of friction necessary to keep the syncros happy in the Muncie.

For the record, I do use Amsoil Z-Rod 10W-30 in both engines, and have had good success. Again, I would like to try the synthetics elsewhere, but apparently I don't want to try it bad enough to pull the trigger.




Last edited by propuckstopper; 07/16/19 12:33 PM.

1965 Pontiac GTO Tri-Power 4-Speed Hardtop (Montero Red)
1968 Pontiac GTO Covertible 400 H.O./Auto (Solar Red)
2000 Lexus ES300
2003 Honda Element AWD
Re: Limited Slip Additive [Re: Snagglefoot] #5162551 07/16/19 01:32 PM
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Char Baby Offline
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I've always just bought the gear oil with the LSD additive already in it.


Retired 6 yrs now & lovin' it
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Limited Slip Additive [Re: propuckstopper] #5162588 07/16/19 02:06 PM
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MolaKule Offline
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Originally Posted by propuckstopper


...Similarly, I use a dino-based gear oil (Sta-Lube GL-4) in the Muncie 4 speed. The "rumor" out there is that synthetic gear oil does not have the correct coefficient of friction necessary to keep the syncros happy in the Muncie...



I think you have heard the wrong rumors. Dedicated MTF's, whether mineral-based or synthetic, are the ones formulated to have the correct FM's and not Sta-Lube.

Last edited by MolaKule; 07/16/19 02:10 PM.

Dr. Larry Fleinhardt: "You know, that term "dark matter" has always perplexed me. It fallaciously implies that the 95% of our universe that cannot be observed is some amorphous, eventless emptiness."
Amita Ramanujan: "I'm sorry?"
Dr. Larry Fleinhardt: "I guess it's all too human. Instead of admitting to the present limits of our knowledge, we just declare things to be unknowable." NUMB3RS
Re: Limited Slip Additive [Re: propuckstopper] #5162594 07/16/19 02:10 PM
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MolaKule Offline
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Originally Posted by propuckstopper
I have always been confused on this issue as well...



I don't know why there should be any confusion.

Even hypoid gear lubes with the LSD additive already in them sometimes requires extra LS additive to reduce chatter.

It's due to different friction materials and the differences in spring loading.


Dr. Larry Fleinhardt: "You know, that term "dark matter" has always perplexed me. It fallaciously implies that the 95% of our universe that cannot be observed is some amorphous, eventless emptiness."
Amita Ramanujan: "I'm sorry?"
Dr. Larry Fleinhardt: "I guess it's all too human. Instead of admitting to the present limits of our knowledge, we just declare things to be unknowable." NUMB3RS
Re: Limited Slip Additive [Re: MolaKule] #5163601 07/17/19 04:09 PM
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propuckstopper Offline
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Hi MolaKule. Thanks for your reply. I have attached pictures of exactly what I am using in the Muncie 4 speed manual transmission. I was told to stick with this product due to the GL-4 specification, as GL-5 is corrosive to brass components. Is this true?

If something like Amsoil MTG would be a better choice, I would be all over it. They do claim it is OK for Muncies, but some Muncie guys say no synthetics.

Your view? [Linked Image]
[Linked Image]


1965 Pontiac GTO Tri-Power 4-Speed Hardtop (Montero Red)
1968 Pontiac GTO Covertible 400 H.O./Auto (Solar Red)
2000 Lexus ES300
2003 Honda Element AWD
Re: Limited Slip Additive [Re: Snagglefoot] #5164150 07/18/19 09:37 AM
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MolaKule Offline
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Look at the choices from Amsoil and Redline.

The last Muncie I had required a 75W90 so Amsoil MTG or Redline MT-90 or MT-75W85 would work.

I have no idea what their latest spec might be but there should be a match out there.

Last edited by MolaKule; 07/18/19 09:39 AM.

Dr. Larry Fleinhardt: "You know, that term "dark matter" has always perplexed me. It fallaciously implies that the 95% of our universe that cannot be observed is some amorphous, eventless emptiness."
Amita Ramanujan: "I'm sorry?"
Dr. Larry Fleinhardt: "I guess it's all too human. Instead of admitting to the present limits of our knowledge, we just declare things to be unknowable." NUMB3RS
Re: Limited Slip Additive [Re: Snagglefoot] #5164746 07/18/19 09:54 PM
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MolaKule Offline
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Originally Posted by MolaKule
Now GL-4 does not necessarily refer to MTF’s, as there are some gear lubes in the
Market place that are GL-4 rated, but are not MTF’s. GL-4 is an SAE wear protection rating.

as stated in:
Last Post

Last edited by MolaKule; 07/18/19 09:55 PM.

Dr. Larry Fleinhardt: "You know, that term "dark matter" has always perplexed me. It fallaciously implies that the 95% of our universe that cannot be observed is some amorphous, eventless emptiness."
Amita Ramanujan: "I'm sorry?"
Dr. Larry Fleinhardt: "I guess it's all too human. Instead of admitting to the present limits of our knowledge, we just declare things to be unknowable." NUMB3RS
Re: Limited Slip Additive [Re: MolaKule] #5164813 07/18/19 11:18 PM
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propuckstopper Offline
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Originally Posted by MolaKule
Originally Posted by MolaKule
Now GL-4 does not necessarily refer to MTF’s, as there are some gear lubes in the
Market place that are GL-4 rated, but are not MTF’s. GL-4 is an SAE wear protection rating.

as stated in:
Last Post


Hi MolaKule. I just ordered some Amsoil MTG for the Muncie, and even went as far as getting the 75W-110 Severe Gear for the posi rear end. I will do the swap next week, and I will be sure to come back here and let you know what my results are. Thanks again.


1965 Pontiac GTO Tri-Power 4-Speed Hardtop (Montero Red)
1968 Pontiac GTO Covertible 400 H.O./Auto (Solar Red)
2000 Lexus ES300
2003 Honda Element AWD
Re: Limited Slip Additive [Re: Snagglefoot] #5168507 07/22/19 10:19 PM
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Snagglefoot Offline OP
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Originally Posted by Snagglefoot
Here is a limited slip additive readily available in Canada at Canadian Tire. I’m trying to find out out how much to add and so far I hear about two to three oz per quart. Anyone have some guidelines on that? I left a message with CRC since there is no suggested dosage. And yes, I know there are some diff fluids that already have some mixed in. My application is a 14 Bolt 10-1/2 inch LS Chev diff. smile

Thanks everyone. I received some input from Yukon Gear and Axle to use 8 oz of LS additive. I used my entire 7 oz tune of CRC Positrac along with my 75w-90 synthetic gear lube. All is fine and running smooth. Here is a final shot of my new AC Delco Diff cover bolted in place. (Painted black).

6BF60D9B-21DB-4B7E-98C2-8049CA0CD3A2.jpeg
Last edited by Snagglefoot; 07/22/19 10:21 PM.

If you want the job done right......do it yourself.
Re: Limited Slip Additive [Re: propuckstopper] #5169936 07/24/19 05:19 PM
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propuckstopper Offline
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Originally Posted by propuckstopper
Originally Posted by MolaKule
Originally Posted by MolaKule
Now GL-4 does not necessarily refer to MTF’s, as there are some gear lubes in the
Market place that are GL-4 rated, but are not MTF’s. GL-4 is an SAE wear protection rating.

as stated in:
Last Post


Hi MolaKule. I just ordered some Amsoil MTG for the Muncie, and even went as far as getting the 75W-110 Severe Gear for the posi rear end. I will do the swap next week, and I will be sure to come back here and let you know what my results are. Thanks again.


So, I received my Amsoil MTG in the mail today, and did the swap in the Muncie. I then took the car for a ride and I tried to remain as skeptical as possible in terms of improved shift quality.

As skeptical as I tried to remain, I could not believe how well the Muncie seemed to "pull" itself into the next gear. Before with the Sta-Lube, the gear box had a very notchy feel, but being that this has been my only Muncie, I thought that it was normal. Not so. There is a dramatic difference now, and I wish I had of used a dedicated MTF in the first place.

Next up will be the Severe Gear in the rear end, although I don't think I will be able to "feel" anything with this change.

Last edited by propuckstopper; 07/24/19 05:21 PM.

1965 Pontiac GTO Tri-Power 4-Speed Hardtop (Montero Red)
1968 Pontiac GTO Covertible 400 H.O./Auto (Solar Red)
2000 Lexus ES300
2003 Honda Element AWD
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