'75 F250 460 - Need Help! -

[460highboy]

I just purchased a 1975 Ford F250 with a factory installed 460! 48,000 originals miles! I am trying to go through all the fluids and make any other necessary adjustments. However, it has been a bare to figure out I actually have...

1st question: How can I tell what year my engine and trany are? The truck is a '75 but I was told the original owner had the dealership install the 460 and HD C6 in '77... How can I tell? visually it checks out great but I want to make sure what year I'm working with when changing fluids and replacing parts.

Then... for the trany - Type F for '75 and Mercon for '76 and newer, am I right?

Transfercase - 80-90? synthetic okay? whats best to use?

FT/RR diffs - 80-90? synthetic okay? again, whats best?

Next, I want to make any immidiate necessary adjustments... The engine is complete stock... Any suggestions? I was told I need to have the distributor worked on and timing advanced... I'm having this done next week. I'd like to get more torque out of her. I'm using as a daily driver as wells as to pull my boat my 4000 lb wakeboard boat around town and up and over the passes...

THANKS FOR THE HELP!

[Mil1ion]

On the heads just below the spark plugs there should be some casting numbers..like

D3VE-A2B

If you pull a valve cover and check in the oil galley you should see another set of casting numbers that may look like this
*4L23*

post the numbers I have referred to.

[NumberDummy]

1971 to midyear 1979 429/460 bare block casting number: D1VE-6015-AB

Midyear 1979 and later 460 bare block casting number: D9TE-6015-AB
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VERBATUM from the 1973/79 Ford Passenger Car & 1973/79 Ford Light Truck Parts Catalogs ~ Section on available lubricants:

AUTOMATIC TRANSMISSION FLUID "MERCON" USE ON 1977 and later C4 - C6 & JATCO TRANSMISSIONS ONLY. See owners guide for proper application.
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All C6 transmissions have an ID code on a metal plate, left side of the trans above the manual control lever.

All the prefixes of the codes for C6's with a 460 engine begin with PJB.

Whatever the suffix is...determines the actual year of usage.

Examples: PJB-J5 or J6 / PJB-L5 or L6 = 1976 F100/350 with a 460 engine.



btw: JATCO was an auto tranmission Ford used in the 1970's on some Ford taxicabs.

[460highboy]

Thanks for the info. I'll pull the covers and post all the numbers I find today!

[460highboy]

Numberdummie - as for the C6 prefixes... J5 - J6 ?? vs. L5 or L6 ?

L6 = 1976 L5 = 1975 ?? then what does J5 or J6 mean?

Thanks a lot!