RyanMerrick
8 Lug
I'm not sure the fan shroud should have too much effect. The fan shrouds on the GMT400 don't seem to be nearly as effective as most stock electric fan setups (on other vehicle models). Fan shrouds in general on mechanical setups just don't seem to be engineered nearly as well as their electrical cousins.
Personally I haven't noticed any difference on the dash temp gauge since I removed the shrouds on my 2500
Personally I haven't noticed any difference on the dash temp gauge since I removed the shrouds on my 2500