Originally Posted by RC10Nick

"Seems balanced" is not the same as "is balanced."

Set your car on your bench. Push down in the middle and quickly release. Do the front and rear of the car return at the same rate? They will if your oils are balanced.

Next step. Drop your car onto your bench from about a foot up. If it doesn't chassis slap, drop it from higher and higher heights until it does. When it slaps, does one end of the car slap the bench first? If you have balanced pack, both ends of the car will slap at the same time.

I have yet to tune a car using this procedure and end up with equal size pistons front and rear resulting in balance.