if your trans is down -3, your pinion should not be at -6! That would net you only -3 on leaf wrap up. you want 0 on wrap (under acceleration) they are facing opposite directions so you have to add the values. -3 /--------/ +3 would be net 0
-3 /--------|+0 would be -3 -3/-----------\ -3 would be -6. Factor in your snubber travel too.