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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

positive id on rear diff

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Old Jan 2, 2005 | 03:36 PM
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positive id on rear diff

i now need to know the model of the rear differential in a 1985 F-150 with the 300 CID straight 6
 
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Old Jan 2, 2005 | 05:22 PM
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One thing you need to know is:
We do not owe you an answer!
You need to be courteous when asking a question!
We also need the info off the cover tag if you are still interested!
Steve G.
 
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Old Jan 2, 2005 | 06:37 PM
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i apologize for my lack of courtesy 8 lugs. i appreciate the brisk humbling. the cover tag has at some point disappeared from the diff cover. any best guess would be much appreciated. thank you
 
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Old Jan 2, 2005 | 08:11 PM
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How about a code from the door?
 
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Old Jan 2, 2005 | 08:23 PM
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unfortunately i am currently in iraq at a camp in baghdad and dont really have access to my truck. i was trying to find some parts to order so they would be there when i got home. thanks for any help you may provide
 
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Old Jan 2, 2005 | 08:38 PM
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It PROBABLY has somewhere around a 3.08.
If you tell me whether it has overdrive or not, and it has a tach, and you can get someone at home to drive it at 60 mph, then tell me what rpm's it registers at 60, I can make a pretty good stab at it.

Take care.
 
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Old Jan 2, 2005 | 08:51 PM
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im confused srercrcr. i think i may have not made myself clear about what i was asking. for that i apologize again. i was looking for the model of axle the F150 with the 300CID straight 6. in case i do need the ratio though, it does not have over drive. the highest gear is 4th. at 60 MPH the tach reads about 2700. thank you for all your help.
 
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Old Jan 2, 2005 | 10:24 PM
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It's probably an 8.8. Is that what you're asking? Ask them back home if it has a cover plate on the back that you can remove. I think it has 12 bolts holding it on, and it has a slightly rounded square shape. Hope that helps....
 
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Old Jan 2, 2005 | 10:41 PM
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thank you for your help, rhodie. ill try to put the knowledge to good use
 
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Old Jan 2, 2005 | 11:25 PM
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If the cover is on the rear as rhodie said, it would be the 8.8"
If the carrier removes from the front side it would be a 9"

An '85 300 - I'm betting on the 9"

And thank you sir for serving our country in a foreign land. I salute you. Tell the men and women you're serving with I'm proud of 'em. God bless!
 
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Old Jan 3, 2005 | 07:14 AM
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My calculations say 2650 rpm at 60 would be a 3.55 axle, with no OD.
That would be the 8.8 inch.
If a 9.0 inch, there's the 3.50.
This assumes standard tires...like a P235/75 or so.
Sorry for the confusion.
Attentiveness isn't my strong suit.
 
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Old Jan 3, 2005 | 05:15 PM
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mtflat i proudly serve and appreciate your help. my wifes dad says that it is a "third member" would i be correct to assume that the differential does indeed remove from the front. thank you again for all your help
 
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Old Jan 3, 2005 | 06:23 PM
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Sorry, but I can't say from that description. I've always interpreted the 'third member' to include the entire axle/differential as one unit. He'll probably think I'm stupid, but I just don't want to guess what he means by that.

Safest way is to indicate if the 10-12 bolts are on the front or rear of the housing.
 
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Old Jan 3, 2005 | 06:42 PM
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mtflat thank you for your time. i'll ask what he means and get back to you
 
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Old Jan 3, 2005 | 07:13 PM
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mtflat my wifes dad says there is no plate cover in the rear of the axle. that would mean that the bolts are in the front i would think
 
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