[68 TT]

You also need to add a panhard bar mount bracket.

An Eaton HO52 / HO72 housing from a 3/4-ton has a nice design bracket that is welded to the axle tube that is easy to copy and install onto another rear end for a trailing arm conversion.

This is by far the least expensive way to go if your existing brakes and axles are in good shape. If you have worn bearing surfaces on your 50-year old axles (likely) and / or your brake drums are shot then the replacement axle method may be a more cost effective option. Inspect your parts closely before you commit to one way or the other.

One upside to the conversion mounting pad option is that you can set your pinion angle and U-joint angles properly to accommodate for a lowered vehicle. I didn't think this was going to be such a problem as my truck isn't lowered that much but it ended up needing over six degrees of pinion angle correction to bring the U-joints into the correct drive angle. This was after moving the front trailing arm mount point to drop the anti-squat down to 100% so it didn't hit the tires so hard but it is still something that needs to be looked at with a lowered truck.

Originally Posted by mdelosrey

Would you happen to remember what the set of axles cost and are the conversion axles on their website?

Another option I was thinking about was to weld on trailing arm pads on the 5-lug leaf axle assembly from the 71. Found these on a quick google search.