Torque tubes were not fun when a u-joint needed to be replaced. My first experience when I was about 16 years old was what the?, It was an early American Motors Rambler. You had a choice of pulling the engine-trans or rear axle to access u-joints. The axle was always the best choice. Now you quote the customer $400.00 bucks when on a normal driveshaft a u-joint back in the 60's was $50.00 bucks. Glad I didn't see many of those.