rear diff lube choices - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 03-21-2009, 03:04 PM Thread Starter
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rear diff lube choices

my gears are broken in and its time to change the fluid. What do you guys think is the best diff fluid for the buck? also locker additive?

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way... dont brake.
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post #2 of 13 Old 03-21-2009, 03:10 PM
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Bump this up for ya. I am going to change mine this summer and i want to know the best oil as well.

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post #3 of 13 Old 03-21-2009, 03:14 PM Thread Starter
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Im thinking of going with the motorcraft 75 140 synthetic with the motorcraft locker additive. Anyone running this?

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way... dont brake.
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post #4 of 13 Old 03-21-2009, 03:19 PM
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im gonna do my front and rear in a week or so and i think im gonna give royal purpler a whirl. with the limited slip additive. most of my friends run that in there trucks (toyotas) kind of difference in the trucks but they seem to like it very well. hope this helps
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post #5 of 13 Old 03-21-2009, 03:22 PM
If it aint a CAT itsa DOG

 
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I have heard a lot about royal purple, but like oregon said i think i would just run motorcraft again. Factory lubes seem to be pretty darn good. I almost forgot you need the additive if you have limited slip. Anyone else going to re-paint their diff covers while doing the fluid swap? Mine are rusty and I want to make em look good.

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post #6 of 13 Old 03-21-2009, 03:24 PM Thread Starter
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ya i was thinking about royal also. there is just so many choices and the gears were spendy. want them to last. hopefully someone who knows whats up sheds a little light on me.

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way... dont brake.
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post #7 of 13 Old 03-22-2009, 11:14 AM
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Amsoil is what I put in before....

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #8 of 13 Old 03-22-2009, 11:31 AM Thread Starter
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ya. its a toss up. 27000 ponds causing ur gears to fail, or was it amsoil?

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way... dont brake.
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post #9 of 13 Old 03-22-2009, 11:34 AM
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LOL... Hard to say... She never got hot! Tell you what, its getting hot now. I am about ready to take it back to get checked out! I hit 210 the other day coming home pulling my flatbed and a 79 Jeep cherokee... Might be just break in but damn!

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #10 of 13 Old 03-22-2009, 03:05 PM Thread Starter
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ya man! there is totally a break in period. take er easy man. 1st 30 miles no harsh acceloration, no high speeds, let it cool completely after 1st 30 consec miles. then after that, still no hard acceloration for the next 100 miles. still trying not to get it too hot. after that you can hot rod, but no towing for the 1st 500 miles till you change the fluid. 500miles is when you change the fluid. this is all according to yukon.

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way... dont brake.
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