adfac
Well-known member
Hi. I just put in a 3.54 rear end with a stock 350 (replacing a 2.73). Seems to me the engine is working really hard at highway speeds. I love the way it drives between the red lights but hate it on the highway. The engine is doing about 3,000 rpm @ 73 mph and it's really working hard at 80-85. Right now, a good highway crusing speed is about 70. I'd like it to be about 80. I also noticed that when I hit overdrive on the highway, my tach doesn't redline but it's definitely up in the yellow area. My question is: What would I have to do to the engine to back off the rpms and smooth out the performance at highway speeds? Any advice would really be appreciated.