I got my 79 last summer but really just started using it. I have a clunking noise in the left rear that I only hear when going a couple mph, I assume this could be the wheel bearing...any thoughts I am new to the trailing arm world, I just replaced the rotor/calipers and pads and I still have the same noise

Does it do it when you first start off from a stop? If so, it may be the posi-clutch pack in the rear differential. Time for a fluid change and a bottle of positrac fluid. If it does it all the time then it probably is not the rear end. But this is the most likely source if a "clunk".

Scott

U-joint
Front trailing arm bushing
Shock mount (upper and/or lower)
Axle flange loose where it bolts onto the spindle
Spindle nut loose

sooo many possibilities...
Wheel brngs normally make a growl/ginding noise at all speeds...
Posi clutches will normally chatter/clunk when turning...
Does this noise happen when accelerating, coasting, when?

IT does not do it all the time, yes I hear it when starting from a stop, I hear it the most at slow speeds such as when I am slowing down turning into the garage with foot on the brake. It also doesn't happen right away only after a driving a couple of miles.... Thks

Can you see if there is any slop in the U-joints?

I will take a look at the joints> I assume I need to have the wheels off the ground and car in nuetral to see if there is play.. any other suggestions on how to check out the U-joints, I am also going to try the fluid change

You won't be able to check the half-shaft u-joints with the tires hanging...there will be tension on them from the suspension. You'll need to check them with the car on the ground, or jack stands under the shock mount, so there is weight on the suspension. The driveshaft joints can be checked wit it in the air with no problem.

I finally have the time to look into this. I have gotten 3 bottles of new fluid and the Posi Trac fluid. I have sucked out about 50 oz of fluid and no matter where I position the suction gun I get nothing else out. The three bottles are 23 oz each plus 4 oz for the posi fluid. this is 73 oz.

 mAKE SURE THE CAR IS LEVEL AND FILL IT UP UNTIL IT STARTS TO OVERFLOW,,MAKE SURE YOU PUT THE POSITRACTION ADDITIVE IN,,GOOD LUCK RD

Thks, I just took it for a ride and the klunking noise is gone. Thks to all for your help