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What type of rear air deflector? One for towing a trailer to deflect air up to get better gas mileage, or one to deflect air down over the rear window?
 

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I've seen them around town here and there. I'll pay more attention the next time that I see one to check out if there is one with the lift-back door or the barn-doors.
 

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A big brick? Unless your going to break the 200 mile an hour mark in your Tahoe I seriously doubt theres any reason to add anything for downforce. If it's a handling thing you might want to look at upgrading your sway bars and maybe doing a 2.5 drop(easy to do) and some nitro shocks.
 
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