Category Archives: Auto Transmission

Cold Automatic Transmission Issues

Based on my experience, I would say that close to 40%, maybe more, of temperature related transmission issues are due to torque converter drain back, and loose valve body bolts (meaning not properly torqued to spec.).  Torque converter drain back is commonly due to a poor trans pick-up filter.  But also can be caused by loose valve body bolts (not just the main bolts, but the bolts that retain the two halves as well).  Loose valve body bolts not only allow drain-back of trans fluid, but also allows torsional twist, binding and deformation of the valve body which can cause sticking or binding valves – especially when cold.  However, after the vehicle is warmed up, the fluid fills up the torque converter and trans and operates normally.  Continue reading