are fj60 axles a direct swap into a 40 (1 Viewer)

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You will need to outboard the springs in front about 3/4" per side, and inboard the perches in the rear.
 
I think front outboard is 1 1/2 inches each side for total width gain of 3 inches.
 
i see this on here a lot to gain an 1 and1/2" on each side is this worth all the work. i understand 60 axles are 3.70 and not 4.11 also the d shaft flanges are not the same plus all the fab work to fit them in is this all worth it when 40 axles work just fine i run 38.5 15x15.5 radial hogs and my truck is plenty wide had to make 4" flares to keep the pa state police happy .im not trying to start anything here just curious as to why
 
Personally I like the added width of both the axle and the springs. My suspension is very balanced front to rear, not to say that my setup is common.
 

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