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+--- Forum: 1971-1972-1973 MUSTANG MACH 1 FORUMS (https://mach1club.com/forumdisplay.php?fid=8)
+--- Thread: Gear Ratio (/showthread.php?tid=6261)
Gear Ratio - bepage1 - 05-20-2015
Hi. I'm building a 400hp 351c for my 72 mach 1. what would be a good rear end ratio to use for power? i have the FMX transmission. ThanksRE: Gear Ratio - 1969_Mach1 - 05-20-2015
How do you plan to drive the car? In town only, on the highway some? With an auto trans and no overdrive, 3.50:1 is a popular ratio when you still want to do occasional highway driving. My older brother ran that ratio in a 69 Mach 1 with a 351W and FMX trans way back in high school. It seemed to be about lowest reasonable ratio to also do some highway driving.
Best Regards,
Mike
RE: Gear Ratio - Mustangmike - 05-20-2015
I have to agree with Mike...it all depends on how you plan on driving the car. If you are planning on putting highway mileage on your car then 3:50 or better yet 3:25 are better choices. If you are looking for more performance, a bigger smile, and less than good gas mileage, you can run 3:89's or 3.91. I opted for 3:89's in my car and have not been happier with the choice. It really depends on what your expectations of what you want out of the car.
RE: Gear Ratio - Mach1FatherFigure - 05-20-2015
+1 on those figures. I've heard of people running higher and lower, but then they run into problems.
RE: Gear Ratio - mrmach1 - 05-20-2015
For everyday driving and highway use I'd go with a 3.25:1 gear ratio.
RE: Gear Ratio - 1969_Mach1 - 05-21-2015
I run 3.89:1 in my 69 Mach 1. But it's a manual trans and I only drive it in town. It's fun in town, but I wouldn't do highway driving with them.
I could see where a 3.25:1 is suitable for regular highway driving. Not as fun in town though.
Best Regards,
Mike