I'm not on the road yet so I cannot speak to the temp drop, but I managed to fit one of the big Earl's oil coolers (along with a more normally sized Tranny one) up front of the radiator. Took some creative routing to get all the hoses and coolers to fit especially around the RS doors but they do fit.
I even went so far as to install a decent sized steering cooler in between (not pictured) the trans and oil coolers.