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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van SPONSORED BY:

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Old 12-20-2011, 03:59 PM
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RP Synchromax

My 04 F350 is @ 160K don't know if man.trans & axle have ever been serviced. Stoped at dealer, talked e'm into running OASIS report & asked for quote to service them $350, thanked him and left.
Don't know capacity of them, first question 6 speed & rear axle qts
Anyone know anything about this
?
Royal Purple® Synchromax ® Manual Transmissin Fluid
What is best for rear axle?



Jim
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Old 12-21-2011, 10:18 AM
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Rear axle takes a synthetic 75w-140 fluid. I would stay away from Royal Purple, they make their stuff thinner to get better mpgs, but it doesn't protect as well. Mobil 1 is good for gear oil, another great one is Amsoil Severe Gear, but Mobil will be easier to find.

Your transmission takes Mercon V ATF, I would go with a synthetic variant like Mobile ATF (Mercon V rated). Put the same thing in your transfer case.
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Old 12-21-2011, 07:07 PM
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Thanks, I picked up 4 qt 75-140 mobil 1, 6 oz friction modifier & synthetic gear oil silicone. 6 qt mercon V. should be good to go, anything other then
just drain & refill?


Jim
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Old 12-21-2011, 07:26 PM
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YOUR TRANSMISSION SPECS MERCON SP, which has been superceded to Mercon LV.

DO NOT use Mercon V in your Torqueshift transmission, it will eventually fail.

Your transfer case only will take 2 quarts.
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Old 12-21-2011, 07:43 PM
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He said he has a manual transmission. Only the 5R110 automatic transmission requires Mercon SP.

To the OP, I believe the Mobil 1 75W-140 already has the friction modifier in it. You can try it without adding it, and if the tires chirp while making tight turns on pavement, then you need to add additional friction modifier.
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Old 12-21-2011, 08:16 PM
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Sorry I seen that after posting, thanks for catching my error.
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Old 12-21-2011, 08:29 PM
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Originally Posted by dchamberlain View Post
Mobil 1 75W-140 already has the friction modifier in it.
I'll check into that, parts guy gives it to all limited slip.



Jim
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Old 12-21-2011, 08:32 PM
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Yeah, you won't need the friction modifier. Everything else sounds like you're good to go. If you do the front axle later, go with 75w-90 Mobil 1.
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Old 12-21-2011, 08:52 PM
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Originally Posted by cartmanea View Post
Yeah, you won't need the friction modifier. Everything else sounds like you're good to go. If you do the front axle later, go with 75w-90 Mobil 1.
I can use it on my 94 F350, changing rear axle now, 437k it is so loose that sensor can't pickup for speedo, coasting gears move back then it works.
Front axle not an issue, 4 wheel drive all at rear. Thanks


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Old 12-21-2011, 08:52 PM
 
 
 
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