FJ80 axle questions
07-05-2009, 01:52 PM
#1
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FJ80 axle questions
I'm wanting to learn everything i can about FJ80 Axles. I'm considering buying some for my Jeep XJ but don't know much about them. What are the strengths, weeknesses in them? Any certain years/types i should stay away from?
07-27-2009, 06:13 PM
#5
Contributing Member
What exactly did you want to know?
They are strong. 5" birf instead of the 3.5 in mini trucks. If you find the right years, the rears are Full Float with disk brakes. Should handle 37" tires stock just fine. To be safe, upgrade to longfields in front, and poly performance chromo shafts in the rear.
Both front and rear came with electric locking differentials on some models. Both front and rear have offset diffs to the passenger side. Meaning, if you have a center drop t-case, and you drive on the road, you are going to get driveline vibrations pretty bad if you use the rear axle. I can't remember what drop the XJ's are in the front, but I thought they were passenger.
63" WMS to WMS in the front, 62.5 in the rear, IIRC.
Front is a high pinion (30% stronger) 8" diff, rear is an 8.875" regular diff. The rear is really strong.
Front high steer can be done with OTT arms (require machining at OTT= have to send your knuckles out) and leaf springs. Slee high steer requires links as leafs will not fit. Figure 6-700 for the steering.
More can be found on IH8MUD, and Pirate.
They are strong. 5" birf instead of the 3.5 in mini trucks. If you find the right years, the rears are Full Float with disk brakes. Should handle 37" tires stock just fine. To be safe, upgrade to longfields in front, and poly performance chromo shafts in the rear.
Both front and rear came with electric locking differentials on some models. Both front and rear have offset diffs to the passenger side. Meaning, if you have a center drop t-case, and you drive on the road, you are going to get driveline vibrations pretty bad if you use the rear axle. I can't remember what drop the XJ's are in the front, but I thought they were passenger.
63" WMS to WMS in the front, 62.5 in the rear, IIRC.
Front is a high pinion (30% stronger) 8" diff, rear is an 8.875" regular diff. The rear is really strong.
Front high steer can be done with OTT arms (require machining at OTT= have to send your knuckles out) and leaf springs. Slee high steer requires links as leafs will not fit. Figure 6-700 for the steering.
More can be found on IH8MUD, and Pirate.
Last edited by AxleIke; 07-27-2009 at 06:14 PM.
08-14-2009, 08:27 PM
#7
Contributing Member
Cool!
I'm always eager to learn new things. For my own amusement and piqued curiosity, would you mind sending me a few links so I can learn more?
Thanks!
I'm always eager to learn new things. For my own amusement and piqued curiosity, would you mind sending me a few links so I can learn more?
Thanks!
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