shaking rear end on s13

[Crunkrich]

This is gonna be kinda long... buckle your seatbelts

before I get started please dont post 'your an idiot a dumb*ss whatever"... I've learned my lesson and I know it was stupid and costly. ok now thats done lol here goes... last weekend I was at a farm in kentucky and we went offroading and I went way to fast over the bumps sliding sideways and whatnot, and then got stuck pretty bad, enough we had to use a tractor to get me out haha.

next morning driving home my car started to vibrate like I had a bent rim or axle whenever I got over 45 mph, so I figured no big deal I have a z32 diff and j30 axles sittin at home this gives me an excuse to swap them on finally. So yesterday I dropped the old diff and axles and installed the z32 + j30 axles and now I have an even worse rumble in the back.... I can't go over 20 mph w/o the rumble.

I jacked the back up w/ the z32 diff and j30 axles on and had a friend spin the wheels at 45 mph and I can see the passenger side axle vibrating up and down so thats the problem.... but how do I fix that??? I'm almost positive the rim isnt bent and I know the axles arent... junkyard 'guaranteed' them. Could I have messed up the brake rotor or something down there?

theres a 240 cruise in 20 hrs from now so I wanna try to fix this bad boy (I know probably wont happen) thanks for any advice you have!

[180fan]

time to replace the axle. Only thing that's holding the axle is the knuckle and the diff.

[JeromeS13]

Make sure something isn't physically broken and also make sure that there isn't any mud/dirt caked onto the wheel.