The enclosed drive-line keeps the guys at work wondering why all those over-size zip-ties they put on your drive-line didn`t make any noise when you drove off grin :p
They are more difficult to work on and inspect for wear and such but they have pretty well shown their reliability for many years

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!