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Old October 13th, 2012, 07:57 AM   #1
jbsjunk
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Default Offset Pinion

I have a 9" from a late 70's F-150 that I'm going to put in my XJ. Total width is within a inch of what's in there but doing quickie measurements on the 9" showed the pinion offset to the pass side 2". I didn't measure anything on the current 35 in it and don't think it's a huge deal but I thought I would ask and see if it could be a problem, now or later. I'm going to rebuild everything and prep it for my Jeep.

What say you, the more knowledgeable diff folks here?
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Old October 13th, 2012, 08:11 AM   #2
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Many axles, and Ford seems to be very common, do this.

Sometimes it is so they can have equal length axle shafts, I've also heard a slight offset helps reduce driveshaft vibration. I had a Ford Dana 70 motorhome axle swapped in my old S-15 jimmy (similar wheelbase to XJ) with a 4 inch offset, never an issue.

Really the only issue with a 9 inch is you are giving up a lot of driveshaft clearance unless you go with a high pinion third member, as stock 9 inch axles have a pinion over two inches lower than most other axles, making them a poor choice in stock form for off-road vehicles, escpecially in short wheelbase applications.
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Old October 13th, 2012, 08:14 AM   #3
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IMO an explorer 8.8 is a better choice if you are thinking stock width. The lug pattern is the same as your 30 front, the pinion is in the "right" spot and the strength is the same as a nine inch.
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Old October 13th, 2012, 08:22 AM   #4
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Quote:
Originally Posted by Route55 View Post
IMO an explorer 8.8 is a better choice if you are thinking stock width. The lug pattern is the same as your 30 front, the pinion is in the "right" spot and the strength is the same as a nine inch.
This!
We've done 9"swaps and 8.8" swaps and I'd go with the 8.8" all day unless youre going full width 44 up front. If youre staying with the dana 30 find a 8.8 and you'll never look back.
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Old October 13th, 2012, 08:54 AM   #5
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I've thought about the 8.8 but I have the 9" now and can't afford to get something else. The axles and drums will get redrilled at some point so the stock wheels will work along with fresh axle bearings. Unless a 8.8 falls in my lap, the 9 will be used.

Thanks for the tips.
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Old October 13th, 2012, 09:17 AM   #6
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The pinion on the 8.8 is offset also, but as was already mentioned it won't matter.
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Old October 13th, 2012, 09:47 AM   #7
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Quote:
Originally Posted by jbsjunk View Post
I've thought about the 8.8 but I have the 9" now and can't afford to get something else. The axles and drums will get redrilled at some point so the stock wheels will work along with fresh axle bearings. Unless a 8.8 falls in my lap, the 9 will be used.

Thanks for the tips.
A late 70's F-150 nine inch will have a large "hub" at the end of the axleshaft that may or may not fit your stock wheels. You may find you have to bore out the wheel centers to fit.

It's been awhile since I've had one of those axles, but I never had an issue getting $75-$100 for them. An 8.8 would cost you $150-$200, so selling your current axle to fund a more "bolt in" swap may be wise. E-brakes are easier with an 8.8 as well, plus you get discs.
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Old October 13th, 2012, 10:53 AM   #8
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I thought of the axle flange but once I measure it and the stock wheels, I'll mod one or the other if needed. Both diffs will be money suckers in the beginning and since I already have the 9", it will be used. E-brake cables won't be a big deal, new ones are cheap and use the same style of end on the arm. I'll make this a bolt in deal, the yoke is the same size as the joints that are being used and since the driveshaft is a fuzz long, this will be nice with the pinion being a bit longer. All I need to get are axle pads and shock mounts to weld on.

At least the pinion offset isn't a issue.
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