I used to make all my crawlers heavy, but I switched to light weight with just a slight forward bias. I installed these axles because I had them collecting dust and the fact I have so much money invested I won't sell them either.. lol ($330 for both axles/brass)
Had these axles with brass laying around and well things happened. Now the truck is considerably heavier.. lol.
But it looks neat. How long I'll keep them on is unknown. I run my stuff light now.
Another pic