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What Differential?

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Old Aug 25, 2013 | 09:34 PM
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What Differential?
Been looking out here for a bit and I'm not having any luck. I'm trying to find out what rear differential I have. The Rig is a 1999 F350, Super Cab, 4x4, Dually, XLT, 5spd manual, V10 hauler built in Jan 1998. I know it isn't a 10.25" or 10.50". I'm left with two different Dana 70s and two different Dana 80s. Will anyone help? Thank you so much!
 
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Old Aug 26, 2013 | 01:54 AM
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F-350 DRW trucks use D80 rear axles. Check the door sticker or the tag on the pumpkin for the specifics of how the axle is configured.
 
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Old Aug 26, 2013 | 05:24 PM
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I already looked for the axle tag. Nothing there. What will the door tag tell me? Not much from what I remember. Thanks!
 
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Old Aug 26, 2013 | 05:26 PM
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Originally Posted by montazch
I already looked for the axle tag. Nothing there. What will the door tag tell me? Not much from what I remember. Thanks!
Gear ratio and if you do or do not have limited slip, for starters.
 
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Old Aug 26, 2013 | 07:13 PM
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I'll do some research. Thanks.
 
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Old Aug 26, 2013 | 07:40 PM
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Well. Axle 61 means I have an Open 3.73. Got that info from dieselbombers.com. I'm inclined to go with the Dana 80 as my axle. Is the Dana 70 for SRW super duty's? I don't know. Just trying to figure out all these things in my head. Knowledge is wonderful! Thanks everyone!
 
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Old Aug 26, 2013 | 07:42 PM
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SRW trucks use a Sterling 10.5 differential.
 
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Old Aug 27, 2013 | 01:59 AM
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The D70 was used in the van's. If you have any doubts about your ratio, jack the rear up and turn the pinion while counting the revolutions of the tires.
 
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