Fairey Overdrive Oil Level

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I just helped my father pick up a 1978 FJ40 that has a Fairey overdrive installed on it. Can someone please tell me how one measures the proper oil level for the unit -- is at the fill plug for the transfer case as normal or on the Fairey unit?

Hey Bart, It sounds like you could use the manual I scanned years ago. Tell your father congratulations on his new purchase. My FJ55 also has a Fairey, and it has its own fill plug. There fill instructions are at the end of the manual.
 

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Hey Bart, It sounds like you could use the manual I scanned years ago. Tell your father congratulations on his new purchase. My FJ55 also has a Fairey, and it has its own fill plug. There fill instructions are at the end of the manual.

John, you are the man! Thank you sir.
 
Okay, so per Mark Algazy's advice, I checked the tightness of the bolts on the Fairey and none of them were tight. Half of them were finger loose. One appears to be missing, but I want to make sure it is not supposed to be this way. Can anyone confirm that this hole should have a bolt in it?

IMG_7339.webp
 
That is definitely a hole that requires a bolt. There are two locator pins as well, but they are not visible.
 
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