Today, took the car to CVE Performance to use their brake bleeding tools. Jacked it up, and noticed the diff wasn't sitting flat on the leafs. The centre stud is taller than the spring perch, so was hitting the axle tube, and not letting it sit flat.
So I lifted the diff up, and ground down the studs, then bled the brakes, then decided the rims needed a polish.
After that, took it for a skid. Noticed the neutral start wasn't working in reverse, so fixed that too. On my way home, noticed a reverse light is not working, so will have to find the wiring fault for that tomorrow.
Summernats is getting closer!!