The axle splines are probably rusted in the hub from all that salt you drive through.

Do what Vstech said. go to a PNP type Junk yard and remove a trailing arm and axle. find a low mileage one. 126 to 85 will also work, same arm.
Note:>> The W126 Trailing Arm will work on a W123, the axle will not. it is a few mm longer due to the wider track of the W126. use the W123 axle.

Torch your axle in the middle, then remove the stub from the differential.

You are going to have to drop the sub frame to get to the 24mm bolts where it bolts to the sub frame.

If you get a trailing arm from the JY, don`t cut the parking brake cable. the cables off each arm are about 4ft long and connect under the center of the car.
I cut the one`s I pulled, the had the dickens of a time getting them reconnected back into the parking brake assy.

at the time I pulled mine, I paid $42 for each one.

Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works