Re: Stock Tire Size, Bronco II For Sale
I have an 89 351W XLT and am running the same size tire. I have the C6 tranny and just installed 4.56 gears. I'm running about 3000 rpm's at 70MPH. The speedo was way off. The original gear in my truck had 18 teeth. I got a 21 tooth gear from Ford and it got me pretty close. I have a Magellan 315 GPS and calculated that I'm off by 6.6%. Each tooth on the speedo gear makes a 5% change. If I could get a 22 tooth gear I'd be on the money but Ford doesn't make one. Or at least that's what the guys at the parts counter tell me.
By the way the gear calculaters will tell you that the ideal gear set-up is around 3.88 or 4.10, I'd stick with 4.56 even though highway miles will suffer(city miles will improve because the truck won't struggle to get moving especially with the heavy meat on your truck). Although Thump is right about the 4.4 gears as per the calculator, remember your tires aren't really 35 inches tall more like 34.75.