No way to temporarily lock the diffs on outcast other than really thick silicone fluid, JB-Weld or epoxy but that's a one-way street. The NERO has that option but the diffs and the diff-cases are 100% different. There is not enough ground clearance on outcast or any other flat-pan chassis 1/8 Buggy/Truggy to do any real rock crawling, that is why you have the twin vertical and the cantilever trucks like savage, hyper Mt, Revo, Nero etc.