Slip the driveshaft off the t-case output shaft slip joint (you'll need to unbolt the driveshaft from the rear axle) and then start the engine and put it in gear, making sure you're NOT in 4wd. Then a quick look at the t-case output shaft as it spins around will tell you if it's bent. Or jack up the rear end and support it with jackstands so both tires are well off the ground and start the engine and shift into 1st gear (again making sure it's not in 4x4). That way you can watch the front of the driveshaft and see if it's running true or if it has excessive runout.
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