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post #1 of 24 (permalink) Old 09-03-2006, 11:01 AM Thread Starter
 
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Rear differential fluid

Well i'm asking this question here instead of a mustang site because there are so many people on those sites with no experience or knowledge who talk out of their ***, with that said this questions is primarily directed towards darrin or dirtydog or anyone else that has experience with lsp 8.8



so what gear oil guys?

Last edited by sleepinggt; 09-03-2006 at 12:06 PM.
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post #2 of 24 (permalink) Old 09-03-2006, 12:31 PM
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Motorcraft 75w140...2.5 qts... 2 bottles of motorcraft friction modifier.
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post #3 of 24 (permalink) Old 09-04-2006, 08:09 PM Thread Starter
 
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Quote:
Originally Posted by dirtyd0g
Motorcraft 75w140...2.5 qts... 2 bottles of motorcraft friction modifier.
Alan
thx
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post #4 of 24 (permalink) Old 09-04-2006, 08:13 PM
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i use the royal purple stuff, it has the friction modifier already premixed.

rpmoil.com i get it from.
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post #5 of 24 (permalink) Old 09-04-2006, 09:02 PM
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Two bottles of friction modifier???

Now I'm getting paranoid...I can't remember how much of both I put in mine...
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post #6 of 24 (permalink) Old 09-04-2006, 09:54 PM
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So what's the recommended fluid for an open 7.5"? Same fluid dirtyd0g said but w/out the friction modifier? I've got almost 180k on mine. I think it's time to change it...

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post #7 of 24 (permalink) Old 09-04-2006, 11:57 PM
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Open rears I just use cheap 80w90. Same thing I suggest for spools and non clutch type differentials.
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post #8 of 24 (permalink) Old 09-05-2006, 05:42 PM Thread Starter
 
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Quote:
Originally Posted by Grasshopper
Two bottles of friction modifier???

Now I'm getting paranoid...I can't remember how much of both I put in mine...

yea the last time i changed mine i had been told to put in 1 bottle of fric mod...hope i didn't burn anything up...and i don't know if the rp stuff has the "right" friction mod pre-mixed in it...i know their atf doesn't have the right mer V stuff in it...let dirtyd0g answer that one
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post #9 of 24 (permalink) Old 09-05-2006, 05:45 PM Thread Starter
 
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Quote:
Originally Posted by dirtyd0g
Motorcraft 75w140...2.5 qts... 2 bottles of motorcraft friction modifier.
Alan
is this regardless of power/slicks that are going to be used in conjunction?

incase it's not...8.8 lsp auto(you probably knew this first part already) on slicks with more than 400 tq on 3.73's ?
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post #10 of 24 (permalink) Old 09-05-2006, 05:58 PM Thread Starter
 
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and i think the tech article might need to be updated...i just read it and it says mobil 1 75w-90
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post #11 of 24 (permalink) Old 09-05-2006, 06:11 PM
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well i got a bottle of motorcraft friction modifier when i bought the trac-lok re-build kit and i used 1.5 bottles of mobil 1 75w90 for fluid. i had this done maybe 9 months ago, works like a charm

-Mike
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post #12 of 24 (permalink) Old 09-05-2006, 06:24 PM
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That is the only fluid and additive I suggest for oem style frictions.
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post #13 of 24 (permalink) Old 09-05-2006, 07:38 PM
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Owners manual says what to use. I put synthetic gear lube in mine. Won't feel a difference, but hey...I have synthetic gear lube in it. Woo Hoo!
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post #14 of 24 (permalink) Old 09-05-2006, 07:59 PM
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lovely, i just put 2 bottles of mobile 1 75w90 in mine.

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post #15 of 24 (permalink) Old 09-05-2006, 09:17 PM
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FWIW, I use a synthetic 80W-140.
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post #16 of 24 (permalink) Old 09-05-2006, 10:45 PM
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ehhh the person that rebuilt my 8.8 and numorous ones told me to buy the mobil 1
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post #17 of 24 (permalink) Old 09-06-2006, 09:57 PM Thread Starter
 
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i think i'm just gonna stick with what dirtyd0g said, i think he's seen one or two of these
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post #18 of 24 (permalink) Old 09-06-2006, 10:05 PM
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Quote:
Originally Posted by Porkchop2oo2
well i got a bottle of motorcraft friction modifier when i bought the trac-lok re-build kit and i used 1.5 bottles of mobil 1 75w90 for fluid. i had this done maybe 9 months ago, works like a charm

-Mike
Ditto here...I racked my brain and remembered that I added 1.5 qts (not synth...dino) + 1 bottle of FM.
So Alan, you think it'd be best if I added another quart of goo and another bottle of friction modifier??? I'm not questioning your knowledge...but what kind of difference would it make from 1.5+1 to 2.5+2???
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post #19 of 24 (permalink) Old 09-06-2006, 10:09 PM
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well when i was filling up the diff with lube/fm it started topping off at around 1.5bottles of mobil one. since you shouldnt force anymore *cant anyways* i didnt add more.
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post #20 of 24 (permalink) Old 09-06-2006, 10:28 PM
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Ford only suggested one bottle of modifier for years,but chatter in corners was a common problem. Many technicians at the dealers have told me to use 2 bottles and the problems go away, from what I have seen they are right. Immediately after I built my own rear it chattered at low speed turns. When I serviced it I changed to 2 bottles and within 5 miles it went away. As far as mobil 1 fluid and others I don't see harm in it however all I feel comfortable using with fords picky frictions is the motorcraft 75w140 and motorcraft modifier. I truely believe companies like royal purple and others will tell you whatever you want to hear to sell their product. When it comes to open differentials who cares they last forever I just put 80w90 that I buy in 5 gallon buckets into them and service them every 50k or so. I don't think it matters so much as to what you use, just that the unit is full of clean fluid. When I build a traction lock differential I suggest breaking it in with one bottle of modifier and 80w90 fluid. after about 500 miles of non abusive driving change to 2 bottles of modifier and the motorcraft fluid. Thats why I always put drain plugs in the cover however to make that alot easier to do.
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post #21 of 24 (permalink) Old 09-06-2006, 10:34 PM Thread Starter
 
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do you know anything about doing an 8 clutch upgrade(or something like that?) on a stock limited slip? i'm not going to buy a whole new diff unit until i'm ready to go to 31 or 33 spline
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post #22 of 24 (permalink) Old 09-06-2006, 10:38 PM
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8 clutch stack is a fairly simple modification. stock arrangement was
shim,clutch,steel,steel,clutch,steel,steel,clutch

for the 8 plate setup
clutch,steel,clutch,steel,clutch,steel,clutch

When all stacked the 8 plate is just a hair thicker than the 6 plate (about .010)
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post #23 of 24 (permalink) Old 09-06-2006, 11:02 PM Thread Starter
 
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does it cost much or take alot of skill to do the upgrade? and is it worth doing?

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post #24 of 24 (permalink) Old 09-07-2006, 12:03 AM
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You'll have to buy 2 sets of clutches or reuse an existing one. The hardest part is getting the S spring back in.
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