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Rear End

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Old 04-19-2007, 11:42 AM
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Rear End

Just curious what everyone is running for oil in their rear end. Going to change mine tomorrow and just wondering what your using and how much i need ( never done it before). Also is there a drain plug, or do i need to take the cover off?



Thanks for the help


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Old 04-19-2007, 11:53 AM
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I run Vavoline Synthetic and you will need to take the cover off.

If you have posi make sure to add friction modifier.
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Old 04-19-2007, 12:07 PM
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see heres the big debate. to put friction modifyer in or not. i was told dont put it back in and the rear will lock up better. put it in and its a friction reducer that lets the clutch packs slip and sometimes no 2 wheel spin ? not sure how much truth in it , but it does make sense. mod reduce = slip. no mod reduce = lock up and fry both treads.
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Old 04-19-2007, 02:51 PM
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What year is your stang? It shouldnt matter but use Synthetic 80W90. Make sure its synthetic or you'll be changing it alot sooner than later. Ford recommends every 3,000kms when its not synthetic.

I used the Motomaster(Schell brand) last time. I change it every year or say 20,000kms.

I would use the friction modifier but if you dont, I'd say change the fluid regularily because friction creates heat, and heat kills oil. I'd still say use it, Ford recommends it for a reason.

Last edited by 94STANGR; 04-19-2007 at 02:54 PM.
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Old 04-19-2007, 06:27 PM
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I put 3 liters of royal purpal gear lube in mine with no friction modifier. Still working smooth.
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Old 04-19-2007, 07:41 PM
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Its a 90 coupe 5.0. Not sure what i need. Please let me know.
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Old 04-19-2007, 07:54 PM
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Originally Posted by 89notchback
I put 3 liters of royal purpal gear lube in mine with no friction modifier. Still working smooth.
I'm pretty sure RP includes FM in the oil, so you don't need it.
Originally Posted by 94stangr
What year is your stang? It shouldnt matter but use Synthetic 80W90. Make sure its synthetic or you'll be changing it alot sooner than later. Ford recommends every 3,000kms when its not synthetic.

I used the Motomaster(Schell brand) last time. I change it every year or say 20,000kms.

I would use the friction modifier but if you dont, I'd say change the fluid regularily because friction creates heat, and heat kills oil. I'd still say use it, Ford recommends it for a reason.
3000kms? you must be kidding. it's usually more like 80k from what I was told. 80w90 or 75w140 will work fine though.
Originally Posted by tear u a new 1
see heres the big debate. to put friction modifyer in or not. i was told dont put it back in and the rear will lock up better. put it in and its a friction reducer that lets the clutch packs slip and sometimes no 2 wheel spin ? not sure how much truth in it , but it does make sense. mod reduce = slip. no mod reduce = lock up and fry both treads.
They put the FM in there to reduce potential clutch chatter on corners, so the clutches will properly disengage during cornering as one wheel is going slower than the other. IMO no FM will wear out the clutches prematurely.

Last edited by Ponyryd; 04-19-2007 at 07:58 PM.
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Old 04-19-2007, 09:25 PM
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i used 75-140 synthetic, with no modifier, haven't used modifier in years and have never had any issues.
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Old 04-19-2007, 10:56 PM
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no modifier here either
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