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yes, remove the inner drive flange (big nut on spindle thread) and take it off. Could be that the bearing assembly is stuck on the arm due to rust 9the trailing arm has a hole that's a snug fit on the bearing assembly, the studs only do the clamping, the fit carries the load) and a chisel between the 2 will separate them.
Not a stock TA but part of my homebrewn stuff but it will illustrate things.
those 4 allen heads are where your trailing arm studs go through, the spindle has a 80-82 type yoke but yours will have a drive flange it needs to come off to be able to take it apart.
You can separate the support with spindle and bearings from the arm. Don't go beating on it though. You will have to remove the rotor, rear spindle nut and flange, then the 4 3/8-24 nuts arouns the PB shoes, get the shoes out of there too. With all these items removed you can tap the support to break it loose from the arm. Depending on how rusted it is will depend on how fast it comes off. Use some PB Blaster on it too. You'll have to torque the nut to 100FT/lbs again plus enough to align the cotter pin. Check feel when you're done should be smooth.
Good Luck
I`ve removed the rotor and PB shoes and unboltet the 4 bolts. It didnt seem like it wanted to separate but i wasnt really trying to hard, just stared at it real mean Tommorow ill give another shot.
Is the 100 ft/lbs bolt the one that hold the inner drive flange on the spindle? That thing came off with a twist of the wrist
If you have a bench vise, put the legs of the support in it and take a block of wood and hammer the t-arm off. Place the block of wood on the top side where the bump stop plate is and on both sides of the backing plate. It will work itself out.