Agree the tranny is the weak link. About 50 hp tune is all i would dare and even then i would put a temp gauge on it....

I have a 2001 F350 with the 7.3 which I had a Edge system on it for about 5 years and up until about three years ago. Worked good. Than it just seemed like no matter how you set it up there just wasn't any difference in performance. So I just removed it. My 2008 6.4 runs hard enough for me. I am in agreement with Unlimited JD. Leave it alone and drive it forever. I now have over 300000 miles with towing thrown in there. Ya the tranny blew on the boat ramp but it was already leaking and ceramic brakes are a great add-on. Just enjoy your new 15 year old truck. I do. [ATTACH=CONFIG]541913[/ATTACH]

460,000 7.3 original tranny. Change fluid like they tell you and pull boat, skid steers and farm equipment. Plus a plow truck. Hope my 6.7 is as good to me as 7.3.