I have never used RTV on my diff covers...just regular grease. Is it "true"? Did you take a straitedge to it? Make sure all the leftover gasket is gone and dress any gouges that may be in the base metal of the diff.
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Had-94,96,98,99 Cobra Stang,99 Navigator,03 Expy, 05 H2
Have-08 Titan C/C,06 GCSRT-425FTLB & AWD, other junk..
Want-08 Viper, 06 M5 
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