I installed one of these on my 2002 F350 7.3 4x4 dually with 4:10 's and let me say it was the best $3000 I've ever spent. In double overdrive my one ton truck gets 23 to 24 mpg at 80mph and all your hear is wind noise. At 80 mph the 7.3 is turning just under 2k rpms. Keep in mind these overdirves can be installed on other trans than just a turbo 400. I am not associated with the seller, I just thought I'd share my experience with a gear vendor overdrive. At $1600 this is a deal....
-Dave
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