Putting sleeves INSIDE a small diameter tube doesn't contribute as much to the strength as you might expect. Common sleeve kits are about 30 % stronger than a stock axle tube on actual bend testing. Its not how much metal you add its the outside diameter that really matters
The Tera axle tubes are slightly larger diameter than a D60 ( ok only a few mm but.... ), the center is much larger and better braced, the "c"'s are massive, the drivers side top control arm mounts is much stronger than stock, the lower control arm mounts are reversed to stop arm bindup, the bracketry is significantly thicker than stock.... are you getting the picture ?
Have a look at a stock one beside a Tera and the arguments over.
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It seemed like a good idea at the time........
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