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Gwagensteve
There's some interesting data in there Tanshi - some of which I've read before, but it was a looong time ago.
It supports why I don't like hilux axles. It also supports my theory that because we already have completed axles, it's hard to justify the complexity of a spline upgrade.
OK, maximum torque of a stock hilux shaft:
6248 ft/lb
Maximum torque of a 28 spline floater in 300M
8668ft/lb
Maximum torque of a 26 spline floater in 300M
8046 ft/lb
So, my rear axles are 30% stronger than stock hilux, and Tanshi, yours will be almost 40%
However, that's not the whole story, not by a long shot. A Hilux is a semifloating axle, so the more you load it from bending force (like from a bounce) the weaker it gets to twisting force. I've seen it written many times that converting to a full floating axle of the same size adds 40% in strength over a semifloating axle of the same spline. That might be optimistic, but lets assume it's true.
Lets also assume you put 4340 axles in your hilux rear end. They're $300 from TG + shipping.
4340 is 1.9 times stronger than stock material.
So, a toyota rear axle in 4340 should fail at 11871 ft/lb, which is super impressive. However, this is where it gets complicated. These figures are for failure in a jig, which doesn't bend the axle, it just breaks it clean, and it's why there's no distinction made in that data between semi and full float.
so, I'm going to assume that a semifloat axle looses up to 40% of its strength if its bent hard whilst being driven, like you're landing a bounce under power. I've broken stock sierra axles like this, and it's how Gregc broke his EN-26 rear floater.
So that drops the 11871 back to 7123 ft/lb
Compare the weight, and ultimate cost of a hilux rear axle with discs, gears, locker and 4340 axles, and it's why I think that a vitara based floater is a very good option.
The provisos are that if you're running a buggy like Ethan's or Appsies, you're not going to get away with suzuki stuff - 37-40" stickies and rock are going to exceed 8000 ft/lb, not to mention the front which is some way under 8K ft/lb, even with DT's, but you might not get away with hilux axles either, and need to look at a toyota full float axle like a 60 series, which I think are superior for suuzki buggy use.
A word on comparitive front end strength. The best DT's are 4340, and 26 spline throughout. That takes the inner axles up to 6794 Ft/lb. Stock hilux inner axles fail at 5000 ft/lb on Bobby Long's (RIP) axle breaking machine. Once again, you need to go to Cromo hilux axles to beat a 4340 DT suzuki front for axle, and possibly even CV strength.
How cool are hilux axles now for your 35" tyred, trail car? No thanks.
Steve.
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