One of the first things I always look at is HP. But, as many people have pointed out already, the chassis flex, lack of a diff and slipper clutch are limiting factors.
After some exhaustive searching, I was able to find out that the DF-03 slipper will work with some mods to the stock SRB main shaft (you have to file / grind the sides flat). Bimdapogs was nice enough to also sell me a ball diff so I was all set there.
Next up on the list was the chassis - I found that there was an aluminum one available so I bought that too along with the improved rear independent suspension from RC Channel, then I sourced some better shocks from RC4wd.com, some shiny alloy wheels and new tires, then a saddle pack and servo.
The remaining challenges are mounting a brushless motor and figuring out how to improve the stock steering setup, while still using the stock radio box (I like the idea of it being water / weather proof).
But here is what I have so far, more as the final parts arrive and I find the time to work on it.
Here is a pic mostly disassembled - in the bottom left you can see the gear box with slipper installed.
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0556.jpg)
Ball Diff and DF-03 Slipper
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0559.jpg)
Radshape RC aluminum chassis and nose plate (I like that its so similar to the RC10). Unfortunately the nose and body were in different anodizing shades but oh well.
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0557.jpg)
RC Channel rear suspension, stainless screw kit and shocks. Unfortunately the shocks only will work on the rear (which I didn't know) but I got different ones anyways.
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0558.jpg)
Savox servo, Thunder Power Saddle Pack lipo and a Castle CM26 brushless motor. I originally thought that the CM26 would be perfect as it would be smaller than a 540 motor but big enough to move the SRB chassis without killing it. Unfortunately, its just a shade too small and I don't think I could mount it properly even if I mod the gearbox. So I have a 540 sized Reedy 3300 kv brushless motor coming that should work with fewer mods.
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0560.jpg)
Alloy wheels from - 1.7"
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0568.jpg)
New tires
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0567.jpg)
New universals installed from RC Channel kit
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0573.jpg)
Rear suspension and chassis guard ready to be installed
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0572.jpg)
Extra parts I needed from ebay (one of the rubber parts bags)
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0571.jpg)
Bearings and Shock Tower Saver
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0570.jpg)
RC4WD 80mm shocks with shock boots
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0569.jpg)
Front shocks and shock tower saver installed
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0574.jpg)
One of the stock spring stops needs to be taken off in order for the shocks to clear
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0578.jpg)
Dremel to the rescue!
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0579.jpg)
No going back now
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0580.jpg)
All mounted up and ready
![Image](http://i1215.photobucket.com/albums/cc517/Chris_Hsu/IMG_0582.jpg)