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Which Differential Friction Modifier Oil? #2851585
11/25/20 08:32 PM
11/25/20 08:32 PM
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RustyMopar01 Offline OP
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I have older Dodge truck with a recently rebuilt 9 1/4 using Yukon Limited Slip setup. I have receipts showing the shop used AT-210 Additive made by ATP. Looking around I see a few different things about modifiers but, wondering if I should use something different other than this product or just stick with what I have? I see Amsoil, Royal Purple, Motorcraft, and Yukon Gear have their own brand of modifier but, some look closely related even down to being the same size for fluid content. Thank you in advance for any help or information you could provide.

Re: Which Differential Friction Modifier Oil? [Re: RustyMopar01] #2851638
11/25/20 11:01 PM
11/25/20 11:01 PM
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stumpy Offline
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If the shop added friction modifier why do you need to add it again?

Re: Which Differential Friction Modifier Oil? [Re: RustyMopar01] #2851784
11/26/20 11:29 AM
11/26/20 11:29 AM
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jbc426 Offline
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Cass, a.k.a Dr Diff has always told me to use the Ford Racing Friction modifier. Add at least one bottle, and use 2 if you still get differential chatter. My local rear end shop recommends the same claiming that even though most dinosaur and synthetic gear oils are being produced with their own friction modifier these days.

The clutches in my Dana 60 started to chatter on turns after a while and I added a second bottle. It stopped it again.


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Re: Which Differential Friction Modifier Oil? [Re: jbc426] #2851786
11/26/20 11:37 AM
11/26/20 11:37 AM
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GoodysGotaCuda Offline
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Originally Posted by jbc426
Cass, a.k.a Dr Diff has always told me to use the Ford Racing Friction modifier. Add at least one bottle, and use 2 if you still get differential chatter. My local rear end shop recommends the same claiming that even though most dinosaur and synthetic gear oils are being produced with their own friction modifier these days.

The clutches in my Dana 60 started to chatter on turns after a while and I added a second bottle. It stopped it again.


Same, I found the best deal buying it off of eBay.


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Re: Which Differential Friction Modifier Oil? [Re: GoodysGotaCuda] #2851804
11/26/20 12:12 PM
11/26/20 12:12 PM
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old_racer Offline
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yesterday my shop Just put in a 9 1/4 Yukon limited slip unit I bought off ebay and it came with a bottle of the ford modifier.

Re: Which Differential Friction Modifier Oil? [Re: stumpy] #2851811
11/26/20 12:24 PM
11/26/20 12:24 PM
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Originally Posted by stumpy
If the shop added friction modifier why do you need to add it again?


Pretty sure the OP was asking if what was used was best for what he had.

Re: Which Differential Friction Modifier Oil? [Re: old_racer] #2851854
11/26/20 01:49 PM
11/26/20 01:49 PM
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Originally Posted by old_racer
yesterday my shop Just put in a 9 1/4 Yukon limited slip unit I bought off ebay and it came with a bottle of the ford modifier.


isn't that something, as yukon has their own stuff. laugh2
as was said, it seems the best buy on whichever product you like best is on the bag.
beer

Re: Which Differential Friction Modifier Oil? [Re: moparx] #2851997
11/26/20 08:44 PM
11/26/20 08:44 PM
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Another vote for the Ford stuff, initially had GM additive but was chattering, the good Dr recommended the Ford stuff and problem solved.

Re: Which Differential Friction Modifier Oil? [Re: BDW] #2852017
11/26/20 09:55 PM
11/26/20 09:55 PM
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RustyMopar01 Offline OP
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Thank you all again. All I saw the Ford stuff mentioned and then looked at some of the other stuff and thought hmm... a couple of these look similar to the Ford stuff right down to the size of the bottle.

Last edited by RustyMopar01; 11/26/20 10:03 PM.
Re: Which Differential Friction Modifier Oil? [Re: stumpy] #2852019
11/26/20 10:02 PM
11/26/20 10:02 PM
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RustyMopar01 Offline OP
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Originally Posted by stumpy
If the shop added friction modifier why do you need to add it again?


Stumpy, I'm planning to change the fluid/oil in the near future since it is fairly new and the rear end has around 3k mile since the last fluid change from the break-in period. So, it had one fluid change at around 500 miles or so and then I wanted to do this one since it has about about 2.5k to 3k miles from that change to inspect and make sure things are good to go since I bought the truck this way with the limited slip already installed.

Re: Which Differential Friction Modifier Oil? [Re: moparx] #2852023
11/26/20 10:05 PM
11/26/20 10:05 PM
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RustyMopar01 Offline OP
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Originally Posted by moparx
Originally Posted by old_racer
yesterday my shop Just put in a 9 1/4 Yukon limited slip unit I bought off ebay and it came with a bottle of the ford modifier.


isn't that something, as yukon has their own stuff. laugh2
as was said, it seems the best buy on whichever product you like best is on the bag.
beer


Yes, I was wondering if the Ford and Yukon are the same stuff. I'm willing to bet it is. Here is the link for the Yukon Modifier.

https://www.summitracing.com/parts/...fxd6h7QIVGHeGCh2AXg0DEAQYASABEgKdU_D_BwE

Re: Which Differential Friction Modifier Oil? [Re: RustyMopar01] #2852038
11/26/20 11:01 PM
11/26/20 11:01 PM
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Grand Prairie,Texas
stumpy Offline
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Originally Posted by RustyMopar01
Originally Posted by stumpy
If the shop added friction modifier why do you need to add it again?


Stumpy, I'm planning to change the fluid/oil in the near future since it is fairly new and the rear end has around 3k mile since the last fluid change from the break-in period. So, it had one fluid change at around 500 miles or so and then I wanted to do this one since it has about about 2.5k to 3k miles from that change to inspect and make sure things are good to go since I bought the truck this way with the limited slip already installed.


That answered my question . Thank you.

Re: Which Differential Friction Modifier Oil? [Re: stumpy] #2852104
11/27/20 09:56 AM
11/27/20 09:56 AM
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I use the FM that GM sells







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