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Old 05-29-2012, 01:37 PM   #1 (permalink)
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71 Ford axles

Looking at a set of 1971 Ford F100 axles. I know it's a hp44 and 9" rear and that's about it. It had the 390 motor. What can y'all tell me about these axles? Like width, spline count....
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Old 05-29-2012, 01:48 PM   #2 (permalink)
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The 71 D44 is a low pinion. Randy's has a shit ton of parts for it, other than shafts. I'm guessing the 9in should be just like any other from that same era.
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Old 05-29-2012, 01:55 PM   #3 (permalink)
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The 71 D44 is a low pinion. Randy's has a shit ton of parts for it, other than shafts. I'm guessing the 9in should be just like any other from that same era.
Well he sent me a pic and I could swear it's a hp. Here's the pic he sent.

Is that 9 the big bearing? I've not had a chance to research any of this since it just fell in my lap and I'm trying to decide if I need to go for it or pass. I'll be running a 4.3 on 36" tires if that makes a difference.
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Old 05-29-2012, 02:02 PM   #4 (permalink)
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I stand corrected. Copied from Mr. N's page: Low pinion axle: The F100 & F150’s of 1966 to 1979 never came with a low pinion axle, at least not from the factory. I’ve standing bet on the Pirate 4x4 Ford forum board for someone to produce a 66-79 Dana 44 low pinion axle from a F100 or F150 4x4. Many have said they have a cousin’s- friend - sister’s -boyfriend -brother that has one. Some have stated they even own one and are going to take pictures this minute and post them. End result: I haven’t lost the bet yet, thread is linked here. The F250 axle was a low pinion Dana 44 until 1977.5, it also had closed knuckles until 75 and leaf spring mounts for all years.


I was thinking of the Bronco 44s
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Old 05-29-2012, 02:22 PM   #5 (permalink)
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I had a '70 F100 9 inch in my CJ, I don't know if they changed in '71 or not.
It was about 61 inches WMS to WMS, big bearing but 28 spline. I had Moser make me some 31 spline alloy shafts for it and ran some big drums off a late '70s 9 inch. The shafts were equal length which was nice because you only needed to carry one spare.
No idea on the front 44.
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Old 05-29-2012, 05:12 PM   #6 (permalink)
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Excellent info guys. Thanks a ton. Looks like these may be the ticket.
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Old 05-29-2012, 07:32 PM   #7 (permalink)
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I stand corrected. Copied from Mr. N's page: I’ve standing bet on the Pirate 4x4 Ford forum board
Almost 10 years now! (Still haven’t lost the bet yet)


Rooney77
Your 71's will have the smaller 260 sized u-joints. Take them out and replace with the 297 (760) sized ones. Get some disk brakes for it too...
As with any axle, make sure to pop the pumpkin cover and check the gears, then check the bearings as well.
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Old 05-30-2012, 08:53 AM   #8 (permalink)
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Almost 10 years now! (Still havenít lost the bet yet)


Rooney77
Your 71's will have the smaller 260 sized u-joints. Take them out and replace with the 297 (760) sized ones. Get some disk brakes for it too...
As with any axle, make sure to pop the pumpkin cover and check the gears, then check the bearings as well.
Full rebuild of both axles will be done. I've decided I'm going to go ahead and buy them. Just gotta get my current axles sold.
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