Originally Posted by
(0000000000)
It is normal. Indeed, this will eventually wear out your spool outdrives and the ends of your CVD's. But we all go through it. It's not a big deal.
This is your answer. Do not buy replacement parts. It is perfectly normal. The chattering is simply down to the use of a spool and UJs that do not allow for different rotational speeds when the car is steering. Under load (on the track), it is not an issue.
Running a front diff will change the handling of the car and reduce drive out of the corners.
If you're desperate to spend money, buy some spare spool outdrives and driveshafts as they will eventually wear out.