Join Date: Jul 2007
Location: Truckee, Ca. 6,000ft
Bypass valve operation
Can someone explain the operation of the bypass valve on the 5R100 transmissions? What parameters cause it to open or close and what are the ranges? Is it strickly ambient temp or trans temp that controls the valve? Reason I asked is today I drove about 80 miles, mostly freeway and a little city and the outside temps were never above 45 degrees. I have a bypass filter system on the truck and the filter never got hot to the touch even though the DashDaq was reading 170ish for the trans temp.
Mark don't beat me up. I know now this truck/tranny, Job 3 build, doesn't need an external filter. I learned about the newer better internal trans filter after I installed the bypass filter and may take this bypass filter off if it's not needed and causing harm.
2008 F-250 Lariat CC 4x4. EPA stock.