Originally Posted by
Numburn
I strongly recommend reaming the arms as stated in the manual. Maybe it isn't as bad on truggy since it has more leverage on the arms to wear in. However when I build my EB I didn't ream them and they never wore in. My car handled horribly until I found this problem and reamed them.
The hinge pins won't rotate freely in the pills, especially if running a lot of toe or sweep. If you don't ream the arms so it can rotate freely there will be a lot of resistance in suspension travel. That's the last place you want it.
Search eBay for 4mm reamer and snag one or use a drill. I don't recommend the Integy one. Their metal is too soft and has trouble shaving Tekno arms.
This is spot on. ALWAYS ream your arms when building the kit or installing new arms. We ream them out until the hinge pin can fall through on its own (~4.2mm). This ensures the suspension can do what it needs to do all the time even if a little dirt gets in. Don't be concerned with 'slop' in this area because if the arms are binding for any reason, the car will not handle correctly.