J80 vs J100 spider gears interchangeable?

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Nov 7, 2021
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Good evening

I have a j100 rear axle which I want to convert to a full floater.
The axle shafts of j100 are 32 splines 34mm in diameter. I need to convert the diff somehow to fit 30spline shafts. Are the spider gears of j100 and j80 /or other 30splne diffs/ same size and shape besides the splines count? And I’m talking about the factory locker differential.
 
Yes, I believe the spider gears are interchangeable. But note, the J100 axle is wider than the J80 axle by about 5 inches.... and therefore the axle shafts are longer too.
 
Yes, I believe the spider gears are interchangeable. But note, the J100 axle is wider than the J80 axle by about 5 inches.... and therefore the axle shafts are longer too.
That is the point, I need to shorten it. I got the j100 axle for a project which I didn’t complete. Now I need a diff for 30 spline shafts and most likely I will use j70 FF shafts it the spider gears 100/80 are interchangeable.
 
Can you clarify? So, in the end, you want the equivalent of a 70 series full floating axle?
 
Can you clarify? So, in the end, you want the equivalent of a 70 series full floating axle?
I have front 70 axle and rear 100. The easiest way to match them by width is to shorten the rear one. I know it might sound strange but here the prices of the axles are insane. Not to mention that finding a full floater is almost impossible.
 
I had a pair of FF 70 series axles I sold awhile ago. LHD from Europe even! Could've sent it back your way! 🍻

Spare_Parts_Small_06.jpg
 

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