ok, I just snapped a factory front passenger shaft at 85 mph....not a good thing. it is an 89 mj, factory 30 front, vaccume disco, 3.07 gears.

are the spline counts the same in all xj/mj dana 30 vacu fronts, 4 cyl, 6 cyl, auto and manual....or are the shafts different?


I am making a junkyard trip in a few hours and need to know ASAP!!!!!

They should all be the same. I say "should" because sometimes Chysler did some strange things, but according to the books they are all the same. You can also look for YJ shaft. If you find a '95 YJ or XJ they should have the bigger 297 joint axles.

Same spline count/size.....

Is your dico on the passenger side of the tube or in the diff? I do know for a couple of years they used a diff vacuum disco in there axles. You will want to avoid these axles, but I am pretty sure they used them before '89. Just one of those odd Chrysler things I was talking about.

If your disco is in the tube then the previous posts still apply.

thanks all...that's what I thought but wanted to be sure.

Originally posted by mkbruin
ok, I just snapped a factory front passenger shaft at 85 mph....not a good thing.

How did you manage to snap an axle shaft at 85 MPH? Did something wad up? Did it lock up the wheel? Sounds like there's a story behind this?

MAN, if this isn't a hint to upgrade your axles then I don't know what is...on tyhe highway??? How? please explain:D:D:D

How did you manage to snap an axle shaft at 85 MPH? Did something wad up? Did it lock up the wheel? Sounds like there's a story behind this?

Maybe a cap worked itself out and :eek: :nuke:

maybe ya'all can tell me!!!!

the axle is all but destroyed.......at least for now.

I'd be better off right now swapping in a junkyard unit.

I have no idea what happened...the drivers side u-joint has been rattling for a few weeks now, that's about all the warning I had. I was driving from fort collins to denver at 4 in the morning and suddenly lost almost all steering and almost all braking.

I made it off the highway without hitting anything and anyone, limped it to a gas station, called for my dad to come and get me.

went back and started to take everything apart, looks like a broken axle shaft, DESTROYED bearing, shreded rotor, and that's just what I can tell by giving it a once over.

maybe you guys can tell me!

Originally posted by mkbruin
I have no idea what happened...the drivers side u-joint has been rattling for a few weeks now, that's about all the warning I had.

That pretty much explains it.

so why would a bad (read: loose) u-joint on the drivers side brek the passenger side shaft in 2wd on the highway?

lets try this then...I know what happened...I just don't know why.

so why would a bad (read: loose) u-joint on the drivers side brek the passenger side shaft in 2wd on the highway?

Then something froze from lack of..... lubrication? :confused: