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Old 05-31-2012, 10:44 AM
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Gear oil selection

Its my neighbors 04 2004 dually Manual Transmission.




This is the tag for the rear diff. Dana 80 right? Am I also correct that it takes 75W-90? If so then I would like to use amsoil.
AMSOIL Synthetic Gear Lube - Gear Oil




And for the manual 6 speed. What oil do you recommend. How often should it be replaced?
AMSOIL Synthetic Automatic and Manual Transmission Fluid
AMSOIL Synthetic Automatic and Manual Transmission Fluid




Thank you!
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Old 05-31-2012, 11:23 AM
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Looks like a dana 80 to me. As far as what oil is recommended for what I would look the truck up under Amsoil's "Auto and Light Trucks" Product lookup guide. It will have both the type of oil to use in each part and the capacity of each part.

2004 FORD TRUCKS F350 PICKUP 6.0L 8-cyl Engine Code [P] Turbo Diesel - AMSOIL Online Product Application Guide
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Old 05-31-2012, 11:32 AM
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I used that. It states 75w-90 and 110. So thats what Im wondering. Its surpising cuz my f-350 takes 75w-140, I thought it would be the same.

And it also gives me the 2 options for the manual trans.
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Old 05-31-2012, 11:37 AM
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I got ya man. Yea it has all to do with the different housing types. Your F350 (like mine) is a SRW with a Sterling 10.5 rear end and that requires the 75-140 where the dana 80 (like the dana 60) can take the 75-90. I would stick with what they recommend in the first of two listed for the dana 80. JMO and hope it helps.
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Old 05-31-2012, 11:55 AM
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Ok then I will get the 75W-90 for the rear.

What about the manual trans. Which amsoil fluid would be best?
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Old 05-31-2012, 12:13 PM
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This is what they recommend you use.

AMSOIL Synthetic Automatic and Manual Transmission Fluid
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Old 05-31-2012, 12:17 PM
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Ok, thanks for your help Nate
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Old 05-31-2012, 02:00 PM
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Yea man any time. Happy to help.
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Old 05-31-2012, 06:57 PM
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i have different weights of oil in the rear and front. Both axles have royal purple....one has 75w-90 and the other has 75w-140.

Last edited by strokin6L; 06-01-2012 at 06:22 AM.
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Old 05-31-2012, 10:53 PM
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In my 10.5 LS I used redline 75w-140 w/o modifiers. Then got some friction modifier from the dealer. I only had to add 3 oz to stop the chatter, and now my truck preforms so much better offroad. Night and day difference.
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