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husker boxster · 02-12-2018, 10:54 AM

Kirk is correct - 05 was a transition yr for IMS in the Boxster and 911. They went from a single row Gen II version to a larger single row Gen III bearing. The Gen II can be replaced, the Gen III cannot w/o a lot of work. The Gen II fails at approx. 8-10% rate while the Gen III fails at approx. 1%.

Unless you have a build date on extreme either end of the model yr (late 04 for Gen II or June / July 05 for Gen III), there's no way to know for sure which version you have until you drop the trans.

02-12-2018, 10:54 AM	#8
husker boxster Registered User Join Date: Sep 2006 Location: Omaha Posts: 2,866	Kirk is correct - 05 was a transition yr for IMS in the Boxster and 911. They went from a single row Gen II version to a larger single row Gen III bearing. The Gen II can be replaced, the Gen III cannot w/o a lot of work. The Gen II fails at approx. 8-10% rate while the Gen III fails at approx. 1%. Unless you have a build date on extreme either end of the model yr (late 04 for Gen II or June / July 05 for Gen III), there's no way to know for sure which version you have until you drop the trans. __________________ GPRPCA Chief Driving Instructor 2008 Boxster S Limited Edition #005 2008 Cayman S Sport - Signal Green 1989 928 S4 5 spd - black 1987 928 S4 - Granite Green Metallic (Felsengrun)