Hi guys, I recently bought a 1995 e350 ambulance with a quigley 4x4 installed and a 7.3 diesel. Love the van and have been doing some basic maintence and up keep type of work since I bought it. One thing that has been bugging me is the shift points are off due to it having larger tires on it. Through this link
http://www.ford-trucks.com/article/...EDOMETER_ON_9296_FORD_FSERIES_AND_BRONCO.html
I can see its possible to change the vehicle constant with the cluster. Now I thought I had it figured out and changed it once......I definitely did not due my math right and now my speedo reads way to fast. Can someone please help me determine what the constant should be that I am changing to?
Current tire size is 305/65/17 and the constant the cluster showed was 1020.
Thank you for the help.
http://www.ford-trucks.com/article/...EDOMETER_ON_9296_FORD_FSERIES_AND_BRONCO.html
I can see its possible to change the vehicle constant with the cluster. Now I thought I had it figured out and changed it once......I definitely did not due my math right and now my speedo reads way to fast. Can someone please help me determine what the constant should be that I am changing to?
Current tire size is 305/65/17 and the constant the cluster showed was 1020.
Thank you for the help.