To start with, an RA40 has an R series motor in it. Clearly you already know this, but I'm just stating the point.
R series motors are different to T series motors, differnet engine mounts, probably different sump setup for cross members, definately different gearbox.
The 3T is a good motor, but you'll find that the 1g also fits into the ra40, and in my opinion is a better motor. Plus it's got two extra cylinders..
for the complexity of conversion you'll have to go through to fit a 3t into a ra40, you will do the same to fit a 1g into an ra40. I'd be going the 1g route.
Unless ofcourse your 3t is going to be carby fed, which means then you won't have to go down the fuel system upgrade path. Clearly you WILL have to do this if you are using EFI 3t or 1g.
Put Simply, in answer to your question, for a 3T into an RA40 you will have to modify your engine mounts and probably cross member/sump. You will ofcourse have to get a T series gearbox to match the 3t as I imagine connecting your W50 to the 3T would be a little difficult, and not worth it. Subsequently you will need to modify your gearbox cross member to fit the T series box. Probably a different length tail shaft too...
For all that stuffing around, seriously mate, the 1g is a better route.
For a rough installation guide of a 1g into a ra23 (which will be very similar to an RA40 cept you'll have more room in the ra40)
look at my guide at
http://www.stradlater.com/install_guide
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