Amsoil Severe Gear for Rear Diff, still need Friction Modifier?
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2009-2014 Cadillac CTS-V Performance Mods Discussion, Amsoil Severe Gear for Rear Diff, still need Friction Modifier? in Cadillac CTS-V Series Forum - 2009-2014; I'm planning to swap out the rear diff fluid with Amsoil Severe Gear. I've seen a couple places that suggest ...
  1. #1
    spearfish25 is offline Cadillac Owners Enthusiast
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    Amsoil Severe Gear for Rear Diff, still need Friction Modifier?

    I'm planning to swap out the rear diff fluid with Amsoil Severe Gear. I've seen a couple places that suggest some of these LSD oils already have friction modifiers and don't need any additional additive. When you guys swap diff oil, are you still adding some friction modifier per GM specs or just using the new oil alone?

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    cruiser68 is offline Cadillac Owners Enthusiast
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?

    I run Severe Gear and I add the limited slip additive.

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    thebigjimsho's Avatar
    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    You MUST add modifier. Amsoil has said as such for our V2s. I ran without the first year with Amsoil and it howled. Sometime in 2010, Amsoil said to add. No more howl with it added...

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    spearfish25 is offline Cadillac Owners Enthusiast
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    Quote Originally Posted by thebigjimsho
    You MUST add modifier. Amsoil has said as such for our V2s. I ran without the first year with Amsoil and it howled. Sometime in 2010, Amsoil said to add. No more howl with it added...
    Sounds good. Modifier from GM and my Amsoil order arrive today. Love that I don't have to lift the back end to get at the diff. Plenty of room to slide under the car.

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    thebigjimsho's Avatar
    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by spearfish25 View Post

    Sounds good. Modifier from GM and my Amsoil order arrive today. Love that I don't have to lift the back end to get at the diff. Plenty of room to slide under the car.
    I have a driveway that slopes downward. I could back the V up onto ramps and have all the space this fatso ever needed...

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    spearfish25 is offline Cadillac Owners Enthusiast
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?

    I appreciate everyone's opinions but decided to ask Amsoil directly. Here is the reply:

    *****
    The Severe Gear line already has added friction modifier. Applications that require more than 4 oz of friction modifier may need additional product added if there is gear chatter.
    *****

    Since the manual only says to add 2.3oz of friction modifier if using GM fluids and draining with the drain plug, it would seem we don't need to add any modifier (unless you hear chatter afterwards, of course).

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    sykb47l is offline Cadillac Owners Member
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?

    Mine needed it.

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    spearfish25 is offline Cadillac Owners Enthusiast
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?

    Quote Originally Posted by sykb47l View Post
    Mine needed it.
    I may just put it in regardless. At least my clutch packs will last longer.

  10. #9
    ENVIOUS V is offline Cadillac Owners Member
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?


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    spearfish25 is offline Cadillac Owners Enthusiast
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    I puss'd out and just put the 70ml of modifier in. Nice and quiet.

  12. #11
    miamictsv is offline Cadillac Owners Fanatic
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?

    Quote Originally Posted by spearfish25 View Post
    I puss'd out and just put the 70ml of modifier in. Nice and quiet.
    What is the part number for the modifier that you use? I may have to put some in mine. Thank you

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    spearfish25 is offline Cadillac Owners Enthusiast
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?


  14. #13
    OldRoadDawg's Avatar
    OldRoadDawg is offline Cadillac Owners Connoisseur
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    Re: Amsoil Severe Gear for Rear Diff, still need Friction Modifier?

    Quote Originally Posted by miamictsv View Post
    What is the part number for the modifier that you use? I may have to put some in mine. Thank you
    http://www.cadillacforums.com/forums...ml#post3060700
    Forum member 'C66 Racing' used to be a vendor for AMSOIL products and was who I purchased my products from last August. Not sure on his status currently, but you could PM him.

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