Weird axle swap (1 Viewer)

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Aug 30, 2017
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‘Mud,

I have a 1977 FJ40 and I have axles from a 1993 FZJ80. I plan to swap the 80 axles under the 40. I want to go SUA, yes SUA not SOA. I plan getting custom made Alcan Springs.

What problems could I run into? Complications with brakes, e-locker wiring, different driveshaft flanges, etc.?

Would high steer be better for clearing the springs?

What are your thoughts?
 
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Jan 6, 2012
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If I recall the differential on a 80 is pretty far to the passenger side on a front 80 axle. I think it will be in the way for where a leaf spring will need to go. You can easily widen a fj60 axle to be as wide as a 80 axle by using housing spacers from 4 plus products. You would get the 9.5 differential and have clearance for leaf springs.
 
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If I recall the differential on a 80 is pretty far to the passenger side on a front 80 axle. I think it will be in the way for where a leaf spring will need to go. You can easily widen a fj60 axle to be as wide as a 80 axle by using housing spacers from 4 plus products. You would get the 9.5 differential and have clearance for leaf springs.

Having the diff in the way would be a pretty major problem.

What’s the benefit of the 9.5 diff over the high pinion 8?
 

Lil'John

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On the rear axle, you will end up spending hours upon hours grinding brackets off:bang: I did a narrowed FJ80 rear axle in my FJ55 on revision 0.5. Not a big deal other than the god awful amount of grinding ;)

I didn't screw with the front axle. But if I recall right, there is an issue with steering parts being the in the way.
 

Lil'John

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Here is a before picture of the FJ80 rear full float:
lj_rearaxle1.JPG


Here is 10-12 hours later of grinding/cleaning:
lj_housing1.JPG

lj_housing2.JPG


For spring under, you will need to cut into the ribbing:
axle2_small.JPG

axle3_small.JPG

In my case, it was narrowed to 55" wide thus the large amount of cut in the first of the spring pad cuts.
 

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