Starting about a month after putting a D-5 in, I started getting this problem. Tranny used to have a non lock TC in it, and I dont know what the prior owner did to prep it for a non lock TC. When I first got it in, I could get the TC to lock at low rpms and high load with a TC switch. Every other component is correct...voltage, switch, everything. They may have a non lock pump valve in it, but if that were true, why could I get it to lock at low rpms and high load?
Anyway the problem is, that after driving for 1/2 hour, the tranny will not downshift when I give it alot of gas, in every gear but first. The engine bogs way down. It bogs harder the more gas I give it. It wont downshift. Boost goes up, load goes through the roof, but it wont downshift. The TV cable is set right and shift points are fine. Someone mentioned the TC solenoid is going out, but lockup has only worked since installing the D-5, when Im climbing a steep hill in OD. Once Im over the hill, the rpms go back up while I cruise. It locks up every time, (or maybe something else is mimicking lockup?) when I go up a hill, but never the rest of the time. Now imagine that I have a lockup pump valve in it, and the solenoid ohms fine. What could cause this heat related issue? My engine coolant temps used to soar when climbing hills when I had the non lock TC in there. After the D-5, everything runs cool.
Million dollar question- Does the tranny fluid pump through the lines and into the radiator when lockup is NOT working? From what i understand, when lockup happens, a circuit opens and allows the tranny fluid to flow through the cooler. The rest of the time it is not flowing through the cooler lines. If I have no lockup, could my tranny be smoking hot and causing issues? Imagine it is getting hot...what is it about getting hot that would cause the bogging and no downshift issue Im talking about?
Anyway the problem is, that after driving for 1/2 hour, the tranny will not downshift when I give it alot of gas, in every gear but first. The engine bogs way down. It bogs harder the more gas I give it. It wont downshift. Boost goes up, load goes through the roof, but it wont downshift. The TV cable is set right and shift points are fine. Someone mentioned the TC solenoid is going out, but lockup has only worked since installing the D-5, when Im climbing a steep hill in OD. Once Im over the hill, the rpms go back up while I cruise. It locks up every time, (or maybe something else is mimicking lockup?) when I go up a hill, but never the rest of the time. Now imagine that I have a lockup pump valve in it, and the solenoid ohms fine. What could cause this heat related issue? My engine coolant temps used to soar when climbing hills when I had the non lock TC in there. After the D-5, everything runs cool.
Million dollar question- Does the tranny fluid pump through the lines and into the radiator when lockup is NOT working? From what i understand, when lockup happens, a circuit opens and allows the tranny fluid to flow through the cooler. The rest of the time it is not flowing through the cooler lines. If I have no lockup, could my tranny be smoking hot and causing issues? Imagine it is getting hot...what is it about getting hot that would cause the bogging and no downshift issue Im talking about?