So it happens around 60 to 70+ (assuming after 70 as well)...It is a rolling vibration lasting for about 3 seconds the off for around 3 seconds and so on...all steering linkage is good wheels balanced same pressure, new front axles/hubs, d-shaft u-joints new, I have really no idea...also it's lifted 4.5" 4.56 locked 33's, heavy duty drag-link tire rod upgrade, dual-stabilizer...
it's the 242 t-case so don't believe they make an sye for it? have it dropped though...and as far as axle u-joints, im running cv's so that's not a problem.