I put 5R shocks on mine and it was night and day difference. The stockers just were poorly made in my opinion. The aluminum wore really quick on the inside due to lack of coating. That made for very inconsistent runs and lots of shock fluid change.
Did they update the diff orings to ones that seal, we always used Kyosho p6 diff orings to make them quit leaking. I got rid of my stuff right after the last bulkhead update, I tried them but the bearing hole for the pinions were still not right and let the bearings and shafts wobble. Just wore stuff out quick.
Anyone looking for some OCM truggys let me know. Got some some to sell just have not got around to it. Will send it overseas.