I've been having a odd transmission issue on my 11' 5.0 SC. Under load in 1 & 2 I get a groaning/slight grinding noise. It is more pronounced as the load is increased, say heading up a steep hill. I also have very slightly firm shifts. My mechanic has done a fluid/filter change along with sealing sleeves on the solenoids and replacement of the common problematic solenoids. Has anyone ever heard of this problem? I have searched.

Just a guess but try to see if you have a vibrating/resonating under shield or heat shield.... Pete
I now have permission from the boss to use Y.O.L.O. Enjoy life
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I just crawled all over the place pulling and pushing on all the shields and they seems quite secured. Dang, I guess its back to the mechanics.