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The torque converter could be the source of the noise. You're gonna need to get a stethoscope to isolate further. The 4.6L V8 does have issues with oil pump failure, you'll need to hook up an external gauge to see where it is at. When the bottom end goes, it usually spins a rod bearing...

Yet another 5r55w tranny with worn servo bores. I am doing this one my back, and circlips are winning. Any tips or tricks for getting these clips out?

Worn servo bores would be my guess.

There are two slightly different length belts - make sure you have the correct one. You may need to have your VIN when you visit your local AutoScrewup parts store.

Have your tires rotated. Lots of folks get fooled by feathered/cupped tires. The noise will follow the tire. Bearings grind, they dont howl.

Just one other thing: I've had problems with Spectra radiators - a common Chinese low-cost replacement radiator. They usually develop a leak at the tank/core seam. Small at first, then eventually a torrent. The radiator cannot be repaired.

I guess you are determined to change head gaskets - despite what anyone says. So get back to us when you are finished.

Thank you for following up on this!

Downstream o2 sensor should hold steady after ramping up. If it is jumping around like the upstream sensor then your pre-cat has likely failed.

Great write up!

Nope. Your long justification is a classic example of uneducated opinion backed by your singular experience. Even when somebody tries to.post helpful info there's gonna be some long-winded "expert" to shlt on it - thats the Internet for ya. I'm done.

My only point is that Mercon V is absolutely the wrong fluid. Nobody is going to walk into a parts store and find a bottle of "Mercon", and if they ask the parts guy they'll end up with Mercon V (and nobody reads the back label which says not use it in TCs). I did a quick search on this board...

Mobile version turns off signatures...... An O2 sensor should show some voltage output - likely bouncing around a bit.

Well I wonder........ Anyways, a little info might help like make, year and engine...... Your scan tool can monitor the O2sensors to see if they're flatlined.

Why did you drive it before you finished the install?

Yea because saving money on fluid so that you get to rebuild / replace a TC makes soooo much sense.

I really dont care what you do, I just want to prevent somebody having TC issues because they used Mercon V.

The TC fluid is $12/quart - you need two.

Hard to find old Mercon and Mercon V is a no-no. Ford makes Mercon transfer case fluid.

Need special transfer case fluid - not plain ol Mercon.

Nope, those kits are a waste. Sonce you dont want to understand your AC system, take it to a shop thst does. A recharge with dye will be about $120.

https://www.obd-codes.com/p0054

Check front wheel sensors.

Didnt you have a tech check it? If you cant isolate this then maybe this job is over your head.

The chain,cams,sprockets have fixed timing relationship indicated by markings - you can time it correctly from any position you can clearly see the marks. PUleys are easy. Fan clutch can be a little tricky - Youtbe and Google are your friends.