Ford still makes a T-stat for the 335 Series the RT 1167 the original application for this stat is the SOHC 4.0L but is listed for the 335 Series also. So any 4.0L SOHC t stat will work in the 335 Series.

 

D9AZ-8575-A = 302/351W = 1979/82 LTD, 1979/85 Grand Marquis, 1980/85 Town Car, 1983/85 Crown Victoria.

D9OZ-8575-A was replaced by D0AZ-8575-A // D9OE-8575-AA is the ID engineering number for D9OZ-8575-A

Most ebay sellers haven't a single clue what parts fit, even if they're brand new w/a part number marked on the package.

The only people dumber than ebay sellers are those that buy parts from them before verifying what the hell they fit!

 

I apologize. I just did quick search for NOS T-Stats on eBay. I didn't research the listings.
I shouldn't have copied them here.

Anyway, The Track Boss from TMeyer works great. Solved my issue.

 

Okay I'll just get the TMeyer. Thanks

 

Thats fair but I've been waiting for your wisdom on this post but when you didn't post I got itchy and trusted the poster..........

 

Didn't post? Open your peepers and read post #8.

 

Numbers Dummy

Post 24 was for you. That's what I was referring too..

 

Post #24 was quoted by you from my post #8 where I listed the 351C/351M/400 t/stat part numbers and their applications.

There's no D9AZ-8575-A listed because it's wrong and I noted that D0AZ-8575-A replaced D9OZ-8575-A

 

Numbers Dummy,
I was just trying to confirm all of those parts listed in 8 are interchangeable for ALL 351M/400's which you just did or you could buy the Track Boss. Thank you!

 

Tim Meyer offers multiple temperatures, depending on what you're looking for. The 195 is the stock thermostat temp IIRC, 180 is also offered by Tmeyer.

 

There is no need to try to source oddball and hard to find T Stats for the 335 Series engines the 4.0L SOHC used the Ranger etc uses a 335 Series compatible stat. These are the modern replacements that supercede the old style 335 stats.

 

1970/74 351C / 1971/78 400 / 1975/78 351M / 1979 351M/400 Passenger Cars:

D0AZ-8575-A (replaced D9OZ-8575-A) .. Thermostat - 192 degrees (Motorcraft RT-139) / Obsolete

BRYDEN FORD in Durand IL has 2 = 815-248-2485. None In Stock

MORROW BROTHERS FORD in Greenfield IL has 2 = 217-368-3037. None In Stock

MILLER OBSOLETE PARTS in Binghamton NY has 2 = 607-722-5371.

ZUBEK FORD in Oscoda MI has 4 = 989-739-3606.

AL WHITE MOTORS in Manchester TN has 5 = 931-728-9700.

CARPENTER NOS OBSOLETE PARTS in Concord NC has 9 = 800-476-9653. None In Stock
------------------------------------------------------------------------------------
D7PZ-8575-A .. Thermostat - 180 degrees (Motorcraft RT-310) / Obsolete

MORROW BROTHERS FORD has 1. None On Stock Bought it for $4 plus shipping Thanks ND

CARPENTER NOS OBSOLETE PARTS has 3. None In Stock

TRI-CITY AUTO WAREHOUSE in Fort Wayne IN has 4 = 260-471-1649.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1979 F100/350 351M/400 / 1979/82 Bronco 351M/400 / 1980/82 F150/350 351M/400:

D9TZ-8575-A .. Thermostat - 192 degrees (Motorcraft RT-1026) / Obsolete

AL WHITE MOTORS has 1.

CARPENTER NOS OBSOLETE PARTS has 1. None in stock

MILLER OBSOLETE PARTS has 3.

GREEN SALES CO. in Cincinnati OH has 5 = 800-543-4959. None In stock

FREESE MOTORS in Monticello IA has 9 = 319-465-3541. None in stock.

I actually purchased the one he had from him because after he did not have the initially he called me back after digging through old inventory. So if anyone needs one, I have an extra. P.m. me and I will give you whatever I don't use. It's like $15 plus shipping.

Or you can go with a TMeyers Trackboss. https://www.tmeyerinc.com/product/high-flo-thermostat/

 

Is there a recommended temperature for the thermostat 180 vs 192?

 

Personal preference. And setup requirements

 

It appears that Orielly Auto parts still can source the RT-139. I'm not sure if it is the same as the original, but I ordered one and will post pics in a day or so when it comes in. Hopefully it is the correct one as my 400 will need a new one after sleeping for 12 years.