Certainly true , plus a lot of other similar parts from what I understand (up until 2013 at least)Ratios are fixed and the mounting points standardised, but its not a spec part. Teams are free to build their own gearboxes, and a lot will. Only a few teams currently buy gearboxes off someone else (Caterham have Red Bulls, and I think FI use McLarens?)
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Nope. Customer chassis are not allowed, and the regulations have not been stable enough to allow this to happen between seasons for a while. I think the last time this happened was Super Aguri running the previous years Honda?
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Im pretty sure Torro Rosso "buy" a lot of RBR parts and have for ages.
I could have sworn Williams even sold their not so successful KERS design elsewhere on the grid too
When Im home I will have to look this up, I was convinced the monocoques where sold on to lower grid teams even now.