Right I've got a bit of an interesting one, I'm building a compition 4wd and need to modify the rear axle to strengthen it

The rules limit me to internal modifications only (can't change the outside of the housing) this limits me to 6.5" or 7" diff head this is where I need some sugestions I'm a bit out of the jap racer scene and I'm after sugestions on what to look at

What I'm looking at doing is machining a new 4 spider diff head into the housing I've got and resplining hilux axles to fit inside

Cheers Reece
De Ranged Engineering