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Heads up for all of the DIY 4L60E guys out there: Sonnax has just released the "SmartShell" which not only includes a carefully engineered reinforced sunshell but also addresses a thrust loading problem that can damage the center Torrington bearing in the rear planetary gearset.
Part number 77749-02K.
Tech article is here: http://www.sonnax.com/announcements/77749-02K.pdf
I was not able to locate a price on this as of this post but since competitor sunshells aren't cheap either, you should consider looking at this option. Also, a broken torrington bearing inside the rear planetary requires you to either rebuild or replace the rear planetary and neither of those are cheap options.
Part number 77749-02K.
Tech article is here: http://www.sonnax.com/announcements/77749-02K.pdf
I was not able to locate a price on this as of this post but since competitor sunshells aren't cheap either, you should consider looking at this option. Also, a broken torrington bearing inside the rear planetary requires you to either rebuild or replace the rear planetary and neither of those are cheap options.