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Old Apr 22, 2009 | 03:39 PM
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From: canada bc okanogan
diff questions

what diffs are in my truck its a 91 7.3 f250 anyone know?
 
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Old Apr 22, 2009 | 03:59 PM
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Open your driver's door and look in the door frame near the striker plate. There will be a sticker with the VIN number and codes. Look at the axle code and tell us what it is and we can tell you the axle ratio and if the differential is open or limited slip.
 
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Old Apr 22, 2009 | 04:02 PM
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For a 7.3L i would assume if you have Twin Traction Beam, its a dana 44HD front and a Full floating 10 1/4 rear???

I could be blowing smoke.... if you got a front solid axil ignore me...
Someone can help here or maybe you could clear up some things too. !
 
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Old Apr 22, 2009 | 04:08 PM
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It will have a Dana 50 TTB up front and a Sterling 10.25" full floater out back. To my knowledge, all diesels came with the Dana 50 instead of the Dana 44HD. Also, supercabs got the Dana 50. My '94 regular cab with the 351 has a Dana 50, but I think this has to do with the snow plow package. The regular cab gas trucks are the ones that you have to check, from what I have been told most came with the Dana 44HD, with a few lucky ones (mine included) getting the Dana 50.
 
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Old Apr 22, 2009 | 04:50 PM
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thanks every1 great source of info i had sum dummy tell me different. also the axle code is C5 what does this mean?
 
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Old Apr 22, 2009 | 06:35 PM
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See here... https://www.ford-trucks.com/article/...de_Chart_.html
 
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Old Apr 22, 2009 | 06:43 PM
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youve got the 4.10 limited slip rear end. which you should deffinately pull out of your truck and send to me
 
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Old Apr 22, 2009 | 08:45 PM
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From: canada bc okanogan
ha like hell when i die haha
 
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Old Apr 22, 2009 | 10:47 PM
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Originally Posted by trugertha
ha like hell when i die haha
And when it does get sent to him-make sure that he pays postage/shipping. (Ouch)
 
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Old Apr 22, 2009 | 11:37 PM
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haha good call on the shipping costs ...so i don't know much about these limited slips do they wear out ?? do they have different parts in them vs a normal rear end? and since its 4.10 rear is that the ratio up front as well?
 
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Old Apr 23, 2009 | 12:19 AM
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Originally Posted by trugertha
haha good call on the shipping costs ...so i don't know much about these limited slips do they wear out ?? do they have different parts in them vs a normal rear end? and since its 4.10 rear is that the ratio up front as well?
The limited slips have clutches in them and they do wear. The factory 4x4s that have 4.10s in the rear differential usually have 4.09s in the front differential.

And rear 3.55s have 3.54s in the front as does rear 3.08s are usually paired with front 3.07s.
 
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Old Apr 23, 2009 | 01:04 AM
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Originally Posted by phoneman91
The limited slips have clutches in them and they do wear. The factory 4x4s that have 4.10s in the rear differential usually have 4.09s in the front differential.

And rear 3.55s have 3.54s in the front as does rear 3.08s are usually paired with front 3.07s.
i thought that they stopped doing the different ratios front to rear in the 70s or 80s or something i only say that because last time i said that it was on a different thread and someone said i was wrong they are same ratio front and rear
 
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Old Apr 23, 2009 | 11:30 AM
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From: canada bc okanogan
and will it be a limited slip up front i onlly ask 1.because im clueless 2. im gunna dig into them cause i don't think they work haha also i can't thank every1 enough for being so helpful you don't get this kind of help on other forums.
 
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Old Apr 23, 2009 | 11:38 AM
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Jack it up lock the hubs spin one of the tires if other spins same direction it's LS if opposite it's open

And ford uses too much LS fluid that causes it to act more like a open diff. Drain the fluid refill it with half the recomended amount of fluid drive it around a turn if one of the tires shudders and drags add a little more fluid. I think they do it so you use your LS less and the clutchs last longer
 
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Old Apr 23, 2009 | 12:02 PM
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From: canada bc okanogan
hmm im gunna go screw around with it now and check it out any way to tell in the rear is worn out???
 
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