Not shocking... Well....MANY 01-02's and some 03's had timing chain tensioner and guide design issues. Apparently Ford fixed the design faw in '03/04, but things do still wear out. Keep in mind, Hondas need timing chains done by 100k. If that carried over to a Ranger, you'd be on your 3rd set of chains and preparing for your 4th... It's wear and tear. They'll need replaced someday and that someday was before yesterday for your truck.
The leaks can be many things. Front or rear main seal, valve covers, the filter itself, etc...
You're probably already looking at $3000ish to fix the problems, and you'll be left with a nearly 300k bottom end. If you intend to keep the truck, I suggest looking into a replacement engine. A newer, lower mile replacement engine. My '01 4.0 started making timing chain slap sounds at only 40k. It progressively got worse over time until I found a deal I couldn't refuse when the truck was at 110k. Timing chain job requires engine get pulled....quoted $1700 to fix. I found a 2006 4.0 with 1,000 miles on the clock for only $1,000! The water pump pulley was still painted completely black....no belt wear. Had to drive 4 hours to get the engine, but well worth it. Did the swap myself.
Locating your new engine, check out car-part.com. It's an online database of auto recyclers and their inventories, categorized by state or region. It's where I located my engine.
'01 XLT disguised as a '03 Fx4 Level II
Big. Loud. Slow. Bright.