Originally posted by Aku-Man
Finally, I fix my diff gear.
I try out debonder almost melt the geat. I use dremel and hobby knife and take out the spacer. Well, I didn't use CA this time, see if its going to cause problem. Need to get some super thin CA. I'm half way there finishing my pro4. Pretty smooth for the drivetrain. The chassis is much stiffer than my Rayspeed SD, but I have to said. The design of drivetrain. SD is still the best to work on. If can combine pro4 and SD, like what Kai do to SD and Evo3. That would be the best drive shaft car. Use Pro4 chassis, suspension system, steering, shock towers, and use SD drivetrain system. 
I used to own the SD... and
I'll have to agree with you..the SD is easier to work on..especially changing the spur gears and diff access.. the Pro4 chassis and performance overall is one of the best...