How about one of these in your speedster. I will definatly look into this at after the 550 build. Imagine a gearbox that you can launch hard with! I am sure it will be pretty difficult to break one of these. In a nutshell they claim that you can modify a scooby 4wd gearbox, convert to two wheel drive and mount in on a pan without cutting the torsion tubes!
http://www.subarugears.com/
If this is the case I am sure that with a little further engineering it should be possible to build a 4wd Speedster.
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