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post #1 of 7 Old 12-07-2011, 07:23 PM Thread Starter
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Diffs Leaking

both my front and rear pinion seals are leaking, I have never done this on a ford superduty diff can I just take the pinion nut off and pull seal and replace or is there a crush washer in it that has to have the back lash reset when done.

also what weights of fluid think I read 90/140 R and 89/90 F, if I use Synthetic in rear with additive is that enough add or do I need more


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post #2 of 7 Old 12-07-2011, 07:41 PM
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Originally Posted by str8wkd View Post
both my front and rear pinion seals are leaking, I have never done this on a ford superduty diff can I just take the pinion nut off and pull seal and replace or is there a crush washer in it that has to have the back lash reset when done.

also what weights of fluid think I read 90/140 R and 89/90 F, if I use Synthetic in rear with additive is that enough add or do I need more

When i did mine on my 97 i marked the nut had the front end up about a foot dropped the driveline removed the nut replaced the seal replaced the nut turned to the same mark lost no oil replaced the driveline. 5k pulling a 5er all good.
If you drop the oil most come with the friction modifiers but if you need to add only 2oz at a time check by making a hard turn at walmart parking lot if it jumps add.
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post #3 of 7 Old 12-08-2011, 06:40 PM Thread Starter
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Thanks I guess after get done my heater core they will next.

04 F350
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Harley Lights
S&B cold air kit (lid delete = more air)
Sinister Coolant bypass
MBRP 4in straight piped
Alpine in dash tv,
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35watt hid fogs
Smoked roof lights
Mephis audio highs
Sub box w/ Mephis Pr's
Edge Insight CS
Studded, Deleted, powermaxed
86 Iroc (slightly modded) 383 stroker pro 1 alum heads 69 302 race cam 8 point roll bar frame connectors 350 turbo trans welds
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post #4 of 7 Old 12-08-2011, 09:00 PM
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is there a how to somewhere on this? my front is sketchy too. I'll need to replace it this summer but good for the winter I think.

Also what kind of fluid can I use, I want the full synthetic.

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post #5 of 7 Old 12-08-2011, 09:39 PM
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This is what i used Amsoil
Front-----Severe Gear 75W-90
Rear------Severe Gear 75W-140
2 stroker

06 F350 4x4 PSD Lariat FX4 CC LB
Edge Insight CTS Expandable Pyro
AutoMeter Fuel Pressure Gauge
Updated Fuel Reg. Kit 3C3Z-9T517-AG
Amsoil By-Pass(Amsoil 5w40)
Delo ELC Coolant
Coolant Filtration System
pulling a 14,000 lb Alpenlite 5er
97 F350 4x4 PSD CC LB
PacBrake&ATS converter lockup
3" dp 4" exhaust
TruCool 28,000 lb cooler
Tymar Intake
A piller EGT,Boost,Trans
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post #6 of 7 Old 12-09-2011, 06:38 AM
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Quote:
Originally Posted by 2 stroker View Post
This is what i used Amsoil
Front-----Severe Gear 75W-90
Rear------Severe Gear 75W-140
2 stroker
I 2nd the Amsoil. And no, I'm not a dealer! The oil is good stuff...works well.
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post #7 of 7 Old 12-31-2011, 06:37 AM Thread Starter
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Might be finally doing this 2mar anyone know how many bottles for each diff.

04 F350
Extreme Street tooon (By Eric)
Harley Lights
S&B cold air kit (lid delete = more air)
Sinister Coolant bypass
MBRP 4in straight piped
Alpine in dash tv,
Limo windows,
55watt hid headlights
35watt hid fogs
Smoked roof lights
Mephis audio highs
Sub box w/ Mephis Pr's
Edge Insight CS
Studded, Deleted, powermaxed
86 Iroc (slightly modded) 383 stroker pro 1 alum heads 69 302 race cam 8 point roll bar frame connectors 350 turbo trans welds
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