Maybe this helps?? https://www.google.com/search?q=1978+ford+ln800+brake+system+diagram&ei=ZOBsYOOuOYS3tAa8hpCICw&oq=1978+Ford+LN800+brake+system+&gs_lcp=Cgdnd3Mtd2l6EAEYADIFCCEQoAEyBQghEKABMgUIIRCrAjIFCCEQqwJQ5egDWOXoA2CzgQRoAXAAeACAAbAJiAHwCpIBBzAuMS43LTGYAQCgAQGqAQdnd3Mtd2l6wAEB&sclient=gws-wiz
Start using Hotshot Diesel Extreme, if not already, from Autozone, etc. Best stuff I've used. Check out their website for discounts & freezies.
Matched injectors from above stated 4 sellers. No crap shoot there.
Spray brake cleaner. It will evaporate. No need for thread chaser. Blue loctite (clean bolts with brake cleaner, apply loctite & let set up before installing)
2 of my 6.9s leaked at rear passenger head & 1 at passenger head top front corner when head gaskets had leaked. You may try re-torquing head bolts (they may break), I chose to replace. I think age got to them more than anything else. I visually checked the heads, no milling, cleaned up with...
I use the Hotshot Stiction Eliminator in my '86 every 5th oil change, FRP in oil on other changes and it runs smoother than ever. EDT on fresh tanks & Hotshot Extreme every 6th refuel. Use gasoline related products in my 2004 Expedition. Very good products. Sign up and get discounts &...
Find one as complete coverage as possible. Body/chassis, engine/transmission, electrical/interior. They are out there. I like paper but most now are on DVD that you can print from.
This guy has been in business for a while & 99.7 feedback rating
Check them all out.
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