REPLACING TIMING CHAIN GUIDE RAILS

[stunt]

I have 134k on my '02 4.6is. I just purchased it in March of this year with 133k on it. The reason I have put less than 1k on over the last 6 month is that I have had to do the following so far:

• Replaced valve cover gaskets (they were leaking bad)
• Replaced radiator (cracked while driving and lost a lot of coolant. Running Evans now)
• Replaced driver window regulator
• Replaced FSR (fan blower motor was not working)
• Fixed stripped oil drain plug (used Time-Sert)
• Did transmission fluid replacement (dropped pan method)
• Replaced oil in front, rear and tcase)
• Replaced fuel, air, engine oil, transmission and cabin filters

Truck runs great now with no issues at all. So my question is, should I be worried about imminent chain guide failure, or should I just start driving the truck on a daily basis and then maybe look at doing the chain guides next summer when I'm at about 150k?

What are the odds that I'll have a failure between 134k and 150k?

If it is less than 10%, I'll likely not worry about it right now, but if the odds are greater than 50% a failure will occur, I'll probably tackle the issue now.

Has anyone here gone past 150k with no chain guide issues? What about 200k?

Thanks!