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Why not just drain the box oil, re-fil with new, maybe even remove the shafts whilst it's empty and check condition? If all's ok, button it back up and run it.
If it get's silly noisy, change it, but if it ain't broke, don't fix it!
To achieve what?
It's got quite a broad spectrum.
My advice would be have a play, follow a couple of tutorials for making a few things similar to what you're trying to achieve, then just go for it.
It's a little clumsy if you're used to CAD or similar, but it's VERY good IME
Brilliant! Perfect for a caption competition:
"Eh guys, you remember all these car's we've been f**king up for years?
Bad news, we'll actually have to admit liability and pay for this one."
Please let us build you a race car, I mean, we can't even be bothered to put our show car together properly, but we promise we'll try harder on yours...
And there's the issue...