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Old 04-06-2012, 12:35 AM   #1
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Default Diff compatibility issue...

Well the 2nd dispaintment of the day (after the gearbox issue mentioned in another thread) is that the 3.9 diff I got is different to the 94 (ish) rear subframe, diff, axles, bigger brakes etc I also recently just purchased.

The older diff has axles that bolt on to half shafts while the 3.9 ratio 98-99 diff has axles that go in to the diff housing directly.

Aaaaaghhhhh. I have done so much research and not once did I see this, then reading the Haynes manual on diff removal it specifically mentions the two types....HOW did I miss this.

Having spent truckloads of money recently on this jigsaw puzzle I welcome any advice for the cheapest, quickest solution.....?
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Old 04-06-2012, 02:40 AM   #2
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Uhhh...use your one piece axles in the 3.9? It's not like they don't fit...or use your 2 piece axles in the 3.9?
I don't see how this is a problem.
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Old 04-06-2012, 02:47 AM   #3
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Right so you are confirming that I should just remove the 2 piece axles and they will install in to the 3.9.... correct?
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Old 04-06-2012, 03:25 AM   #4
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Quote:
Originally Posted by mx5-kiwi View Post
Right so you are confirming that I should just remove the 2 piece axles and they will install in to the 3.9.... correct?
Sure. My torsen came with stubs and I popped them out and used 1 piece axles.
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Old 04-06-2012, 05:45 AM   #5
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yeah or use your 94 axles.
the only real difference are axle nuts. NB cars have bigger nuts.
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Old 04-06-2012, 08:45 AM   #6
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Cool thanks guys.

Advantages, disadvantages of 1 piece v 2 piece for track day sort of work...?
or effectively no difference..?
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Old 04-06-2012, 01:08 PM   #7
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None I have seen.
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Old 04-06-2012, 01:18 PM   #8
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2 piece axles are easier to get in/out when you don't have the whole rear end apart. The only time you would have to worry about the axle/diff mating is if you're switching from any 1.6/1.8/Mazdaspeed to another of those 3.
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