TURQUE CONVERTER CLUTCH

[HUM GOOD]

It seems as though my torque converter clutch is staying engaged. I am getting a vibration throughout the rig at just under 2000 RPMs between 45-50 MPH. If i just tap the break the vibration disappears and the RPMs jump about 300 revs and rig feels perfect. I hooked up the programer and there are no DTCs...it's all clear.

The trans which is in now is my second one......it has about 5000 miles on it, hopefully they changed the converter with the trans....I have a 3 year 100,000 mile warranty

My questions are:
Is the converter covered under this warranty?
I installed an after market larger cooler, and took the radiater out of the loop. Will this void the warranty if they know i did this?

[It\'s a Dry Heat]

I have the 8 year 100k warranty. I'm going to let it blow!