Hey. I'm restoring a 52 m38a1 and lack knowledge with the mechanical aspect of it. I drove it to a local welder to install panels I bought and its top speed was around 35. At this speed, it shook really badly. Someone suggested that It was because 4x4 was engaged, but I do not believe it was. Has anyone else experienced this problem, or do you possibly know what the problem may be and what could restrict the speed on my vehicle? Thanks!