71 fj40 aftermarket birfeilds?

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Apr 20, 2003
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I have a 71 fj40 and am swapping mini truck knuckles to get disc brakes, while I have the axle apart, I wanted to put marfeild or newfeild birfeilds in, but they only have them for the fine spline 75 and up . Has anybody done this before and have any solutions for me? Also should I change to 4:88 gears, while I have the axles apart? I'm going to run 39.5 swampers, and I'm running a 350 small block, sm465, and a toyota 3 speed transfer case. Thanks
 

woody

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Jan 15, 2002
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Toquerville UT
an automatic update when you do discs from a minitruck is th then run the mini birfields and lockouts. Longfields are a natural update from there.

The coarse spline units you took out are now "useless", but worth $25 to a desparate soul on the trail.

FJ40 inner axles from 1971 will work with minitruck birfs or Longfields.
 

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