Your 'Guide' to the 727/904 transmission

[moparsquid]

I will come by the shop tomorrow to check them out. couldn`t get there today. Thanks

The owner will be there around 9 I'll be there around noon

 

[Dipstick]

The wider groove on the console-column cable bayonet is needed for the additional play associated with these setups. That is what I read during my research on these cables. Please correct me if I understood this wrong.

Yes, the socket that the cable plugs into has a spring inside, the wider groove keeps the cable from bottoming out and kinking when the shifter is placed in park.

 

[440 Charger]

Often I or anyone for that matter asks to find out what type of transmission they have in their old mopar. There are hundreds, if not a thousand, of threads on this website identifying, discussing or assisting with this process, troubleshooting or repair.

Because of this large number of threads and the fact that using the search option is unbeknownst to some members, I have put this together.

FIRST AND FOREMOST, HERE IS FRONTAL PICTURES OF THE /6, SB, AND BB TRANSMISSIONS:

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HOW TO IDENTIFY YOUR TRANSMISSION:

1. Do I have a 727 or a 904?

The picture of the 727 transmission is first, the second is a 904 transmission –


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Gasket pictures to see what you may have from a bottom view

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2. Here are pictures of 4x4 transmission 727 on the left and 999 on the right

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3. Where do I look for the identification number’s on my transmission?

You will see a set of numbers starting with “PK” on the driver’s side of the transmission above the tranny pan but below the shifter levers, see below:

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The passenger side carries with it (if its 69 model year only) the complete VIN of the vehicle, 1970 and above have the year, place of manufacturer, and serial number of the vehicle it was made for, see below:

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4. What are the differences between a A518/46RH, a 904/999/A500 and a 727?


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5. What do I have to do to put a OD transmission in my older vehicle?

Here is a start. There are many sites that cover this swap, but this one is pretty good to get you going.

http://www.transmissioncenter.net/SwapInformation.htm

6. Why is a 727 called a 727 and a 904 called a 904?

The 904 was originally called the Torqueflite 6 and the 727 was the Torqueflite 8. These designations were changed in '64 when the 904 was adapted for use in the new 273 V8 and was no longer a 6 cylinder only unit.

7. What is the difference between a truck and a car tailhousing?

TRUCK HOUSING:

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CAR HOUSING:

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8. What is the difference, externally, between a 65 and below 727 and a 66 and up?

65 and below will have the parking brake mechanism located on the outside of the tailshaft housing (see right silver transmission), and the transmission mount is located in a difference place, and has wider bolt/stud mounting holes.

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Also, 65 and below were a pushbutton design:

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9. What are the differences between the shift levers, are there any?

Generally, a 727 shifter lever is straight and a 904 is offset (though some applications have different length of levers to compensate for vehicle model/engine combinations).
727 on top, 904 on bottom:

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10. This will give you an idea to the different styles of throttle pressure (aka kickdown) levers:

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11. Good reference on what each port does in the transmission case:

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12. BREAK DOWN OF A 727:

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13. DIMENSIONS BETWEEN 727 AND 904:

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Remember, only smallblocks have 904 derivative transmissions, though some came with 727’s (i.e. certain truck and HP car models). Big Blocks only came with 727’s.
And here is a kicker to boot.. International Scout’s and other IH trucks used 727’s also.. so did AMC’s here is a pic of a AMC 727:

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Great resource book:

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http://search.barnesandnoble.com/Torqueflite-A-727-Transmission-Handbook/Carl-Munroe/e/9781557883995

WELL THAT ABOUT DOES IT.. HOPE YOU ALL GET A LITTLE INSIGHT FROM THIS.. I MAY ADD TO THIS AS I GO ALONG.

Great knowledge so how about a 1972 Motrorhome 727?

 

[Brandy]

Thanks for the illustration of where all the rods and springs go in the valve body. I have two that I need to assemble. Now I need a good clear illustration of where the check balls go.....

 

[440 Charger]

I would suggest if your going stock valve body transgo tf1 shift kit it fixes all the problem things with our old 727 tf3 for mild tf2 for street tf3 for street strip.

 

[Brandy]

I would suggest if your going stock valve body transgo tf1 shift kit it fixes all the problem things with our old 727 tf3 for mild tf2 for street tf3 for street strip.

Will the TF 2 installation sheet detail where to put the check balls?

 

[Brandy]

I need a new separator plate anyway, the old one is getting grooved where the check balls ride back and forth. I HAS a shift kit in it already. Not sure which one though. Don't remember what the plate has stamped on it.

 

[MoparLeo]

Nice to know what you have. Must be pretty old to put grooves in the plate...Get a new one with pictures.

 

[440 Charger]

Will the TF 2 installation sheet detail where to put the check balls?

Mine has seperator plate and detailed instructions and when I had a question called the help number and the guy who wrote the guide talked to me that was a big plus. Just be slow and easy things have to be close to perfect on the 727 then many years of fun.

 

[440 Charger]

Nice to know what you have. Must be pretty old to put grooves in the plate...Get a new one with pictures.

Grooves in the sep plate would be a very bad thing.

 

[440 Charger]

Awsome Transmission the one thing learned the hard way is the over running clutch some are bolted some are splined you want both lol.

 

[440 Charger]

 

[66Satellite47]

Years ago I used a TransGo kit in a 727 I built for my tow vehicle. It worked very well for that application. It used the stock separator plate that you modify with parts in the kit. The instructions are very clear. Those instructions show the location of the balls, of course so does a FSM.

 

[Brandy]

My two plates...one has a 79 cut into it and the other has a 161.

 

[Brandy]

How can I identify the springs and where they go after knocking the damn things off the counter and mixing them up? lol. The valves are easier to sort out. Any help?

 

[MoparLeo]

know this doesn't help you right now but for others this is a perfect example of why you should have a service manual for anything you plan on taking apart.
Get on line and check Youtube videos.
http://www.mymopar.com/index.php?pid=109

 

[Brandy]

know this doesn't help you right now but for others this is a perfect example of why you should have a service manual for anything you plan on taking apart.
Get on line and check Youtube videos.

You are right. I have an expert helping me out now. Between us we should be able to set it straight, I hope.

 

[66Satellite47]

Ghost, you will be amazed at how often the factory service manual can help you. You just need to avoid being hung up on all the "special Mopar" tool numbers & figure out available tools can do the job. Once you digest the details, a 727 is very simple. Using the correct combination of internal parts for your application is important.

 

[Brandy]

Ghost, you will be amazed at how often the factory service manual can help you. You just need to avoid being hung up on all the "special Mopar" tool numbers & figure out available tools can do the job. Once you digest the details, a 727 is very simple. Using the correct combination of internal parts for your application is important.

I agree. I have the trans rebuilt with no issues. Just the valve body left to do. Tom Hand is assisting me with id on the springs.

 

[66Satellite47]

OK, not sure which springs you are talking about since there are many springs in a 727. The front servo springs, front clutch return springs, various valve body springs. All make a big difference in how the 727 performs.