[RC-Monster Mike]

If you don't think your current truck is worth much, keep it for parts. You will need the tranny anyways. Then, you can build the g-maxx and upgrade as you breaK stuff (diffs, cvds, etc). This will allow you to spread the project over a few weeks without breaking the bank all at once. Although if you have the $$, and a lack of patience (like me!), you could pretty much build from scratch (just need a transmission).