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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

9" rear end

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Old Jul 30, 2019 | 06:55 PM
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Question 9" rear end



I bought this rear end from a guy that had it laying behind his shop. How can I tell what I bought. I payed $125.00 for it. I stopped at the car wash and cleaned some of the grease and build up off the rear end. I was told it came off a 1971 ford ranger truck. We could not tell anything about it since it was covered in build up. What is the gear in this unit
 
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Old Jul 30, 2019 | 07:00 PM
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Complete axle drum to drum? Or the removable 3rd member? Is there a thing sheet metal tag on one of the studs holding the 3rd member in the housing?

If no tag or other numbers, you can turn the pinion and count the revolutions of the pinion vs. the axle shafts. Or take it apart and count the teeth.

Several ratios were available, but 3.50 is a bet that will win about 33.333 to 50% of the time.
 
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Old Jul 30, 2019 | 07:03 PM
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From the numbers on the tag it looks like a 3. 25 geared rear end.
 
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Old Jul 30, 2019 | 07:59 PM
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https://www.ford-trucks.com/forums/1...l#post18778517
 
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Old Jul 30, 2019 | 10:25 PM
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It's a 3.25 open diff from a mid 70s.
 
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Old Jul 31, 2019 | 11:16 AM
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There is what I call a slinger ring behind the yoke on this rear end, and it is tack welded to the yoke is that the norm for these rear ends or did some previous owner do some modifications.
 
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Old Jul 31, 2019 | 12:15 PM
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Those slingers are only pressed on. They are common to work loose(been there), so tack welding it is not a big deal. Mine was on the carrier bearing assembly. As you drove it would start to spin, stopping quickly would resonant a whirling sound til the piece stopped turning on the shaft. Annoying.
 
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Old Jul 31, 2019 | 12:19 PM
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This is good to know. I saw it when cleaning and wondered what he did that for. Thank you Freightrain.
 
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Old Jul 31, 2019 | 02:47 PM
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Originally Posted by Tex51


I bought this rear end from a guy that had it laying behind his shop. How can I tell what I bought. I payed $125.00 for it. I stopped at the car wash and cleaned some of the grease and build up off the rear end. I was told it came off a 1971 ford ranger truck. We could not tell anything about it since it was covered in build up. What is the gear in this unit
WDM-S = 9" 3.25-1 Rear Axle with 4 pinion gears, without Limited Slip. Slim Line (tapered roller) differential bearings, large axle bearings.

9LA = Assembled the first week (A) of November (L) 1969 (9), so it would have been installed in a 1970 F100 originally.

Slim Line bearings were introduced in 1970 from serial number J30,001, replacing the ball type differential bearings.
 
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Old Jul 31, 2019 | 04:18 PM
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Thank you ND for this information. I am writing it in my manual I am putting together for this truck, so I can keep up with what all I am putting in it. I bought one of these trucks brand new in 1969 and wished I would have not sold it. I am now building my own 1969 to keep and drive here in small town Paris,Tx. Thanks for all your help!
 
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