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727 Trans. Questions #3037592
04/27/22 12:33 PM
04/27/22 12:33 PM
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440mopar Offline OP
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I have a 727 I'm putting behind a 400/470 stroker motor and have a couple questions. I'd like to know what would be a good choice of stall speed would be for the torque converter. The car will be a street driven only car and will have 3.73 gears in the rear. I would prefer to go with whatever the lowest stall speed would work. I'd also like to know if a deep aluminum trans. pan is something I should consider. I'd prefer to use the stock pan but will invest in a deep aluminum pan if necessary. Thanks.

Re: 727 Trans. Questions [Re: 440mopar] #3037618
04/27/22 02:47 PM
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Are the rotating parts, crank assembly, internal or external balanced?
If external make sure the converter has the weights on it to match your motor, if not don't worry about it.
I would look for and use a 11 inch stock converter for a big car like a C body or a 2 barrel B body BB motor up
I'm talking about a converter that would foot stall from 2000 RPM up to a max of 2600 RPM and still work well at part light throttle driving twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 727 Trans. Questions [Re: Cab_Burge] #3037627
04/27/22 03:11 PM
04/27/22 03:11 PM
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Usually, those recommending a torque converter want to know more details about the engine build.

As for a deep pan, I prefer stamped steel as it will bend rather than break if something hits it. A cast aluminum pan is more likely to break than bend. Now, do you need a deep pan? Maybe, it won't hurt though.

Re: 727 Trans. Questions [Re: Sniper] #3037891
04/28/22 09:02 AM
04/28/22 09:02 AM
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2800 to 3000 stall.


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Re: 727 Trans. Questions [Re: GODSCOUNTRY340] #3038004
04/28/22 04:02 PM
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440mopar Offline OP
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The rotating parts are internally balanced.

I have these three torque converters that came along with big block 727's I have purchased over the years. I have no idea if they are originals or aftermarket as there is very little marked on them, no brands or part numbers. The only things I see are the one on the right has 764 stamped in it as well as written on it and it has a capital A with a capital R connected to the A stamped into it. It also has a V and a G stamped on the backside. The middle one with the yellow cap has 764 written on it with a black marker and a sticker on it that most of the printing is worn off of other than the word stall. The one on the left has the numbers 17 and 3 and an odd symbol that looks like Y. Do any of these things mean anything? Also, is there any way torque converter can be tested at a trans. shop to see what they stall at?

DSC00004.JPG
Re: 727 Trans. Questions [Re: 440mopar] #3038013
04/28/22 05:26 PM
04/28/22 05:26 PM
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Originally Posted by 440mopar
The rotating parts are internally balanced.

I have these three torque converters that came along with big block 727's I have purchased over the years. I have no idea if they are originals or aftermarket as there is very little marked on them, no brands or part numbers. The only things I see are the one on the right has 764 stamped in it as well as written on it and it has a capital A with a capital R connected to the A stamped into it. It also has a V and a G stamped on the backside. The middle one with the yellow cap has 764 written on it with a black marker and a sticker on it that most of the printing is worn off of other than the word stall. The one on the left has the numbers 17 and 3 and an odd symbol that looks like Y. Do any of these things mean anything? Also, is there any way torque converter can be tested at a trans. shop to see what they stall at?


THOSE ALL LOOK LIKE 340 "HI STALL" 10 3/4 INCH CONVERTERS... ABOUT 2200-2400 ..GREAT ALL AROUND UNITS....I USE EM IN EVERYTHING

Re: 727 Trans. Questions [Re: ph23vo] #3038019
04/28/22 06:00 PM
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Post a pic of the front for each converters.

And a pic of the stamped numbers may help ID them.
The one on the left being turquoise looks more like a big block converter.

And you can’t “test” a converter without a test stated.

Last edited by Transman; 04/28/22 06:04 PM.
Re: 727 Trans. Questions [Re: A727Tflite] #3038050
04/28/22 09:07 PM
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440mopar Offline OP
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From left to right as shown in the pic of all three.

DSC00004.JPGDSC00005.JPGDSC00006.JPG
Re: 727 Trans. Questions [Re: 440mopar] #3038052
04/28/22 09:09 PM
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Numbers/letters.

DSC00003.JPGDSC00002.JPGDSC00001.JPG
Re: 727 Trans. Questions [Re: 440mopar] #3038059
04/28/22 09:41 PM
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Look here. converter

Re: 727 Trans. Questions [Re: 440mopar] #3038064
04/28/22 09:59 PM
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I would use one of the two that have the bigger converter 7/16 bolt bosses on them, more than likely they came out of an HP motor made after1962. you need to make sure the splines in the converter match the splines on your tranny front pump and shaft wrenchscope If you can take it to a good local tranny rebuilder that can flush it for you on their machine and see if any debris is flushed out or not and ask them to inspect it for you and see what they say
Mopar change the splines in 1966 or maybe in the early 1967 production year, all the original Max Wedge motors and all the Hemi motors and all the other HP BB had those larger 7/16 converter to flex plat bolts and holes in the flex plates. Not all of them had the same splines inside though depending on what year they were made for scope twocentsThe small spline tranny will fit in the large spline converters and work for a while, depending on how you drive it, before it fails shock
The large spline trannys won't fit in the small spline converters, no matter how hard and long you try to make it fit up work scope grin


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 727 Trans. Questions [Re: Cab_Burge] #3038071
04/28/22 10:18 PM
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They all have the small converter bolts but that shouldn’t be a problem for you. None of the production B/RB had big bolts except Hemi and MaxWedge.

If you have a loose input shaft stick it in the converter and spin it a few times then pull the drain plug. If no metallic debris comes out its probably a good unit.

You won’t know stall speed until you get it in the car.

If you can take a good clear shot in each converter the stator may have some ID on it that can help you determine stall speed.

Post some pics and I’ll see if it will help.

Re: 727 Trans. Questions [Re: 440mopar] #3038214
04/29/22 12:32 PM
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764 is a rebuild industry number for the factory 2801764 hi-stall 11" converter.


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Re: 727 Trans. Questions [Re: ph23vo] #3038220
04/29/22 12:46 PM
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Originally Posted by ph23vo


THOSE ALL LOOK LIKE 340 "HI STALL" 10 3/4 INCH CONVERTERS... ABOUT 2200-2400 ..GREAT ALL AROUND UNITS....I USE EM IN EVERYTHING


I was going to say, put a tape measure on them.

If they are a 340 hi-stall, and you put it behind a warm stroked big block, they will flash higher than they did behind the 340.

As recommended. try to make sure nothing is wrecked inside and they didn't come out of a trans that was wrecked. A little oil, a little agitation, and see what comes out the drain plug.


If the results don't match the theory, change the theory.
Re: 727 Trans. Questions [Re: CMcAllister] #3038461
04/30/22 12:09 PM
04/30/22 12:09 PM
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440mopar Offline OP
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"If you can take a good clear shot in each converter the stator may have some ID on it that can help you determine stall speed.

Post some pics and I’ll see if it will help."

I was going to take pics but I looked inside and there is no i.d.

"I was going to say, put a tape measure on them."

They all measure 11" and 13" across the ring gear.

Re: 727 Trans. Questions [Re: 440mopar] #3038477
04/30/22 01:00 PM
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Originally Posted by 440mopar
"If you can take a good clear shot in each converter the stator may have some ID on it that can help you determine stall speed.

Post some pics and I’ll see if it will help."

I was going to take pics but I looked inside and there is no i.d.

"I was going to say, put a tape measure on them."

They all measure 11" and 13" across the ring gear.


The ID I am talking about is not numeric or alphanumeric.
It’s a series of marks.
The ring gear doesn’t represent size, the impeller does. The “donut”.

Last edited by Transman; 04/30/22 01:01 PM.






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