My 1967 FJ 45 has a Chevy 327 v8 engine and SM420 4 speed transmission and a Toyota 3 speed transfer case. It is switched to high range, but winds out in top gear at about 40 mph. It's geared in a very low geared rock crawling mode. I need highway speed capability. I'm exploring all options. I'm in the New York City area. I was wondering if anyone had any thoughts, solutions or experience with a similar situation. Thanks. Rob