After buying several wrong gaskets from the Auto parts stores because the number listed is incorrect, here is the text from Felpro:
“ran your vin number through our GM parts computer, it asked me to choose between a SSR or Trailblazer, after choosing the SSR it informed me that it had no RPO code definitions, so I looked up the rear differential and it offer two gasket numbers, these numbers interchange to Fel-Pro part numbers RDS55479 & RDS55387, the RDS55387 has 14 bolt holes & the RDS55387 has 10 bolt holes, please see the attached pictures, so you can match it up to your cover.”
Mike in AZ recommends re-using the original gasket which is rubber coated metal.
Mine was beyond re-use. The solution was to go a a Differential Specialist with
the Simple Engineering Cover with Amsoil for the scheduled maintenance
“ran your vin number through our GM parts computer, it asked me to choose between a SSR or Trailblazer, after choosing the SSR it informed me that it had no RPO code definitions, so I looked up the rear differential and it offer two gasket numbers, these numbers interchange to Fel-Pro part numbers RDS55479 & RDS55387, the RDS55387 has 14 bolt holes & the RDS55387 has 10 bolt holes, please see the attached pictures, so you can match it up to your cover.”
Mike in AZ recommends re-using the original gasket which is rubber coated metal.
Mine was beyond re-use. The solution was to go a a Differential Specialist with
the Simple Engineering Cover with Amsoil for the scheduled maintenance
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