Maybe you should get a new 16.8 E-Maxx tranny. Has the Revo slipper, great new gears and components, and even has the option parts for a single motor plate. Check out ebay, there's a few on there. After you sell your tranny (or swap it into your wife's and sell hers), you wouldn't be spending too much more than you would if you bought a new slipper setup. You could also keep the tranny for your wife's spare if money isn't an issue.
I missed out on this, I was gonna bid on it and forgot. Man that would've been sweet!
http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=006
http://cgi.ebay.com/New-16-8-E-MAXX-...QQcmdZViewItem
http://cgi.ebay.com/New-Traxxas-16-8...QQcmdZViewItem