Friction modifier

Discussion in 'Engine & Performance' started by TxFx04, Jun 16, 2012.

Page 1 of 2
  1. Jun 16, 2012 at 3:52 PM #1
    TxFx04

    TxFx04 FFS Frequent Traveler

    Age:
    32
    Posts:
    21,338
    Likes Received:
    25
    Joined:
    Jan 17, 2011
    Location:
    Conroe, Tx
    So at very low speeds turning i get a shutter in the rear end aka the clutch packs in the back are going bad. I picked up a bottle of friction modifier to solve it. Question is, How much do i add? Do i have to drain my diff fluid to add it or can i just add it as is. My truck has about 82k miles on it. is it time to replace diff fluid anyway?
     
  2. Jun 16, 2012 at 3:55 PM #2
    jlyoung08

    jlyoung08 gumby

    Age:
    36
    Posts:
    9,674
    Likes Received:
    1
    Joined:
    Feb 27, 2011
    Location:
    nederland texas
    get a diff delete kit
     
  3. Jun 16, 2012 at 4:09 PM #3
    AK SNO RIDER

    AK SNO RIDER Got Snow?

    Age:
    32
    Posts:
    4,524
    Likes Received:
    393
    Joined:
    Mar 25, 2011
    Location:
    Soldotna, Alaska
    I had a shudder like that too and it was simply my u bolts needing a good tightening.

    Sent from my Milestone X using Tapatalk 2
     
  4. Jun 16, 2012 at 4:16 PM #4
    TLSF150

    TLSF150 Full Access Member

    Age:
    36
    Posts:
    5,366
    Likes Received:
    34
    Joined:
    Jul 1, 2011
    Location:
    Stockbridge, Ga
    Lmao x2.....

    No but mine did that when I first got it... I just changed my fluid with some synthetic vavoline fluid that already had the modifier in it and haven't had any problems since..

    Sent From My HTC EVO LTE Using Tapatalk 2!
     
  5. Jun 16, 2012 at 4:26 PM #5
    TxFx04

    TxFx04 FFS Frequent Traveler

    Age:
    32
    Posts:
    21,338
    Likes Received:
    25
    Joined:
    Jan 17, 2011
    Location:
    Conroe, Tx
    I'm just wondering if it'll mess up my diff if i just add some FM to it instead of draining the diff. On the bottle it says to drain the diff but i don't see why i can't just add some
     
  6. Jun 16, 2012 at 6:05 PM #6
    DestinationFX4

    DestinationFX4 Admanistrator

    Age:
    34
    Posts:
    4,798
    Likes Received:
    0
    Joined:
    Feb 8, 2011
    Location:
    College Station, TX
    You may as well change your fluid. It's recommended at 100k
     
  7. Jun 17, 2012 at 2:02 AM #7
    VanoFord

    VanoFord Banned

    Age:
    45
    Posts:
    6,925
    Likes Received:
    0
    Joined:
    Nov 29, 2010
    Location:
    In my own imaginary world, where. Respect for wome
    The modifier doesn't work well with oil that is already broken down. It's hard to modify crap ya know and that's what bad oil is: crap. I know th manual says 100k or something but I do my diff once a yr, twice if I was haulin more than norm. I also flush my tranny more than te manual says but that's why I'm runnin 140k on original power train. Cough up the $50 in diff oil and do it right. The oil is cheaper then buyin a new diff setup if that goes out.
     
  8. Jun 17, 2012 at 10:38 AM #8
    Big'un

    Big'un BillyBadAss

    Posts:
    14,556
    Likes Received:
    4
    Joined:
    Nov 27, 2010
    Location:
    Dont Matter
    u cant just simply add to it pb ....... when u fill a diff u take the plug out and fill it til i runs out the drain plug hole .... so technically it prob wont even hold a half quart or so before it runs over anyways ...... so u will have to drain it
     
  9. Jun 17, 2012 at 11:32 AM #9
    TxFx04

    TxFx04 FFS Frequent Traveler

    Age:
    32
    Posts:
    21,338
    Likes Received:
    25
    Joined:
    Jan 17, 2011
    Location:
    Conroe, Tx
    that's what i needed to know. Looks like i have a project for next weekend. What gear oil do i use? and i got some universal friction modifier, should i go to the ford house and get the motorcraft stuff? i'm guessing i have to take the diff cover completely off and reseal it with whatever that is? Sorry i've never done this before.
     
  10. Jun 17, 2012 at 12:03 PM #10
    Big'un

    Big'un BillyBadAss

    Posts:
    14,556
    Likes Received:
    4
    Joined:
    Nov 27, 2010
    Location:
    Dont Matter
    its like 75w90 or some shat , its in one of them fawnky shaped bottles with a tit on it .....

    and pic up a tube of permatex to make u a new dif gasket with or u can pick up a gasket from the Ford dealer only ........ i just used permatex on my rab tho it worked and didnt leak ........
     
Page 1 of 2

Share This Page