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Author
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Topic: How do you change your gear oil?
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50sneak
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Member # 8533
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posted
 
 
How do you change your gear oil? for your gears in your rear end on a 91 5.0 mustang GT???
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1989 50 coupe
Posts: 274 | From: sacramento | Registered: Jul 2008
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Blind
2.3L
CAFords OG
Member # 3052
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posted
pull the diff cover, drain
replace diff cover with silicone for a gasket all around, torque the bolts
pop the fill plug on the other side of the diff, fill with ~2 - 2.5 qts of synth gear oil and a bottle of friction modifier from ford for the trak-lok.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Peter Hatch
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Member # 7676
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posted
What ratio of friction modifier to gear oil do you guys use? I just filled up my diff after pulling the axle but I'm curious.
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2000 Mustang GT
Bright Atlantic Blue 5-speed.
Posts: 577 | From: San Jose | Registered: May 2007
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50sneak
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Member # 8533
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posted
To tell u the truth I don't even know I'm was goin to ask yal but I'm just about to royal purple all my oils engin tranny gear oil and coolent
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1989 50 coupe
Posts: 274 | From: sacramento | Registered: Jul 2008
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asskickn88
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Member # 4957
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I think the synthetic oils don't need the friction modifier but I could be wrong. Maybe there is synthetic with it already in it that I was thinking of. If you just pulled an axle and lost a small bit of fluid then I'd just top it off with gear oil but if you drain the whole thing then you need to add a full bottle or tube of the friction modifier.
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Three 540 Bimmers and a 5.0 Explorer.... got a Ford back in the stable!
It's time for the country to do what Obama's own father did.
Abandon him.
Posts: 6069 | From: Rocklin, Ca | Registered: Oct 2004
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92stangLX
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Member # 3252
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quote:
Originally posted by Peter Hatch:
What ratio of friction modifier to gear oil do you guys use? I just filled up my diff after pulling the axle but I'm curious.
You can get a small bottle from the Ford dealer. Just add the whole thing and then put in the gear oil.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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89foxstang
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Member # 5908
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yeah i just mix the modifier with the gear oil in the bottle before its empty so i know it mixes well. It probably would anyway but im just ocd like that haha
Posts: 825 | From: Davis | Registered: Aug 2005
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by asskickn88:
I think the synthetic oils don't need the friction modifier but I could be wrong. Maybe there is synthetic with it already in it that I was thinking of. If you just pulled an axle and lost a small bit of fluid then I'd just top it off with gear oil but if you drain the whole thing then you need to add a full bottle or tube of the friction modifier.
some do, but not all, and it doesn't hurt to add the friction modifier, I asked several people at the ford dealer about it
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Ty
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Member # 4920
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posted
see ive heard that your not supposed to use synthetic with the trak lok because the clutches have a harder time grabbin and lockin up
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DRIVE FAST TAKE CHANCES
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90 gt nothin special, just your average bolt ons...OUT TO PASTURE
69 fastback project car
Posts: 1400 | From: vallejo | Registered: Oct 2004
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SLOWSN95
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Member # 8269
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im sure that the synthetic wont hurt in the least bit as long bit as long as you use the LSD additive which you should use every time anyways ![[burnout]](graemlins/burnout.gif)
Posts: 2214 | From: 510/east bay | Registered: Mar 2008
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by v-town50:
see ive heard that your not supposed to use synthetic with the trak lok because the clutches have a harder time grabbin and lockin up
all svt vehicles come with synth diff gear oil from the factory.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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jawsgear
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Member # 8080
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posted
Most positraction manufactures now days are not going to warranty any differential that has had synthetic oil in the differential. It is damaging the clutches and not allowing them to function properly. We run a standard 80w90 Valvoline with a ford friction modifier. Rule of thumb is 4oz of additive to every 2 quarts of oil. We use synthetic only in high heat situations like drag racing or road racing to keep the gears cooler.
Jeff
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Jaw's Gear & Axle
916-922-5297
Parts & Service
Gears, Posi's, Lockers, Spools, & Axles
Custom Housings & Axle Shafts
Posts: 91 | From: Sacramento, California | Registered: Dec 2007
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85gtcarbro8du-up
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Member # 5169
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a little tidbit of 411. you probly wanna pop the diff plug before you do anything else, that way you know your gonna be able to fill it after you drain it. i used to work at a qwik lube and you wouldnt believe the amount of dumbass people who had their cars towed in because they drained the oil before popping the fill cap. or even had some kind of stripped or rounded out type of plug for oil pan, trans, or rear end.
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weiand blown 302 with all the goodies
too many horses and ft lbs for a t-5. looks like rebuild or upgrade time
Posts: 76 | From: antioch | Registered: Jan 2005
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jawsgear
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Member # 8080
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That is actually a great suggestion. I can't even count the times people have brought us their car for a diff oil change and had the fill plug stripped. Excellent suggestion and is actually the first step our mechanics do before opening up any differential.
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Jaw's Gear & Axle
916-922-5297
Parts & Service
Gears, Posi's, Lockers, Spools, & Axles
Custom Housings & Axle Shafts
Posts: 91 | From: Sacramento, California | Registered: Dec 2007
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