First get a copy of the manufacturer's service manual and read through the pages of instructions before even thinking about attempting this. You will need to remove either the engine, the transmission, or both together.
Next, to verify this is the cause of the shudder, drive at a speed high enough to make the torque converter lock up, typically above 45 mph, in the highest gear, with the engine warmed up. Hold the accelerator pedal steady, then tap the brake pedal with your left foot. That will make the torque converter unlock, (in preparation for coming to a stop), then it will relock in two or three seconds. If you have a tachometer on the dash, you'll see engine speed increase around 200 rpm, then drop back down again. A shudder caused by slipping clutch plates inside the torque converter will occur when it relocks.
Most lockup clutches don't wear out yet by the mileage you listed. Another possible cause of the chatter, or shudder, is using the wrong transmission fluid. Some transmissions are real picky about having the right fluid characteristics. Adding a can of "mechanic-in-a-can" additives rarely solves this. A better attempt at solving this is to replace the fluid and filter. Dropping the pan to replace the filter will remove about half of the fluid. That is usually sufficient to get enough of the right additives in the system.
Thursday, December 3rd, 2015 AT 6:40 PM