Noticed slight slip/delay during downshift at less than 5 mph up a steep paved grade. 340K on vehicle and I assume on trans. What's the average life of this generation transmission? Ball park $$ to have it rebuilt? While trans is out, is it sound to install new rear main seal? Or too many miles on thrust bearing to matter? Oil pan is creased, so time to replace that and leaky oil filter adapter housing o-rings etc. as well.
Thanks!!