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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 09-09-2011, 03:45 PM   #1 (permalink)
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Rear Differential

I have a 1997 ford f350 i do not have a metal tag on my rear end and im trying to find out if i have a locker of not in it to determine what oil i need to run and how much oil. Ford says 75-140 synthetic...others say 80-90 gear oil but i dunno if i need the additive anyone have any ideas i think i have 355's in it.
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Old 09-09-2011, 05:04 PM   #2 (permalink)
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As soon as you remove the cover you will see what it is ... the VIN and the door sticker will tell you the Axle code ... 39 is the Open 3:55 ....I use 80W90 and change it every 50,000 kms ( half of recommended service interval) Alot of guys use synthetic but since I change it myself and am Old School I use Dino....
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Old 09-09-2011, 05:28 PM   #3 (permalink)
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Originally Posted by smithw44 View Post
I have a 1997 ford f350 i do not have a metal tag on my rear end and im trying to find out if i have a locker of not in it to determine what oil i need to run and how much oil. Ford says 75-140 synthetic...others say 80-90 gear oil but i dunno if i need the additive anyone have any ideas i think i have 355's in it.
jack the rear axle off of the ground..truck in neutral...turn either wheel..if the other turns the same way..posi..if not open..open,,75w140,,,posi whatever Ford says for that year..
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Old 09-09-2011, 05:58 PM   #4 (permalink)
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What does it say under "Axle" on the door jamb label?
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Old 09-11-2011, 07:10 AM   #5 (permalink)
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Thanks

Never thought about about looking on the door jamb I will do that today and post on here. Thanks for everyones replies
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AFE stage 2 intake
Retro-Solutions 6000K HID Headlights, and Fogs
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Old 09-11-2011, 04:04 PM   #6 (permalink)
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the axle code on the door say C9
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MBRP 4" exhaust
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AFE stage 2 intake
Retro-Solutions 6000K HID Headlights, and Fogs
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Old 09-11-2011, 04:06 PM   #7 (permalink)
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axle code on the door says C9 i called ford with the vin number and they said there computer doesnt go back usually more then 10 years couldnt help me told me to find metal tag on axle...to look it up what numbers in the vin would tell me what kind axle is in this?
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AFE stage 2 intake
Retro-Solutions 6000K HID Headlights, and Fogs
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Old 09-11-2011, 05:29 PM   #8 (permalink)
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with the info i have c9 is a limited slip with 355 gears
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Old 09-11-2011, 05:53 PM   #9 (permalink)
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yeh thank you!i looked it up on google and found a chart from ford listing all there rear ends and the axle code. appreciate your help!
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MBRP 4" exhaust
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AFE stage 2 intake
Retro-Solutions 6000K HID Headlights, and Fogs
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