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My f-450 with the 7.3 liter and the 5 speed tranny seems to be wound pretty tight when trying to do 70 on the interstate. My tach isnt working but the engine seems to be reved mighty high. At 60 - 65 mph its still seems high but is bearable. Has anyone else experienced this? If so was there a fix. Im thinking maybe rearend gears or different gear in tranny. Other than that I got a small leak around the block heater to fix. I got a new block heater but have yet to install it. You think it might be a good I dea to put a little rtv back on the heater before replacing it? Gonna post pics as soon as my decals and ford emblems come in. I painted the bed,cab, the chasis, and also the rims.Its looking great. I have mounted my welder,my toolboxes, and my ox.acc tanks also. Just a few more loose ends to tie up and Im ready to hit the road with her I think. Thanks for the help.