On the safety side I would say every 5 years but have gone as far as 10 years if there are no cracks and feel flexible. The hardest part of the job is removal/installation of the drive which is very heavy. You need to make sure the alignment is correct as well. I would review the procedure in the manual that can be found under Documents of this site.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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