Sorry Josh, my bad.
The first batch of "Silent" belts was rumoured to be slightly different from the ones later included in the SP kits.
Part of my mistake was that I bought a whole pile of goodies to put on the car when I did the upgrade.
I find that the torque rod pulls the tail of the chassis up, thus loosening the front belt(It moves the entire rear gearbox slightly up/forward).
If you look at the tiny gap between the motor plate and rear bulkhead, you'll see that the gap at the bottom is greater than the one on the top, basically the rear of the chassis is flexed upwards/forwards slightly.
You will also need to file the rear of the topdeck slightly so that the lug machined into the gearbox housing(for the extra motor plate screw on the PRO and WORLDS car)won't stop you adjusting the torque rod past a set point.
Just have to check tweak to make sure everything is hunky-dory and you're off.