So here's today's dilemma: the trans is already off, I've dumped $10,000 on rebuilding it, replacing the suspension, plus new tires, wheels, brakes, etc. and I'm waiting for my new ac compressor to arrive before I can reassemble the accessories. This is a 2011 6.2L with 148xxx miles. ZERO leaks. Should I risk the extra step to replace the rear main seal or calculate that if it's not leaking now it won't later? I've never done it before, don't have the tool, and sure don't want to cause a leak by installing it wrong.