904 Identification

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MonkeyTrev

MonkeyTrev

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My Dad has a 904 that I am looking at installing in my Barracuda. I’m having a hard time finding anything on the id of the trans. The number is either 373 3632 3258 or 873 3632 3258. It’s gonna be powered by a 360 that I am building. I need to know the year so I can purchase a rebuild kit for it from Mancini racing. Thank you for the help.
 
Edit below because I messed up.

Bad.
 
Last edited:
Alaskan_TA said:
3258 would be the final assembly date, June 30, 1970.

So it is likely from a late 1970 model year or 1971 model year car, what is the partial VIN on the passenger side of the case?
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I believe it is either 2C112828 or
20112828

9DC1C2DB-1992-42F9-BCCA-8E566161FC48.jpeg
 
2 is the model year - 1972

C would be Jefferson, MI car assembly plant (larger cars, C-bodies)

If that is a G it would be from a St. Louis car (B-body)
 
The 72 904 has the large input shaft and uses the large torque converter/crankshaft register. Various stall converters are readily available. 65'
 
Plymouth 65 said:
No, but there's a good selection of torque converters for the large size register. A properly built 904 can handle 500+ HP. 65'
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That will be plenty for my 360, I’m hoping to make 400hp with it. It’s a long shot, but the block is bored .30 over. I did an at home port job, new isky cam, edelbrock airgap, Hedman headers, windage tray, electric fan, and looking around at electric water pump. I’d love some edelbrock aluminum heads, but the money doesn’t always match the dream.
 
So would I want a rebuild kit for a
Alaskan_TA said:
3258 would be the final assembly date, June 30, 1970.

So it is likely from a late 1970 model year or 1971 model year car, what is the partial VIN on the passenger side of the case?
Click to expand...
So would I want a rebuild kit for a 70 or 71? Mancini has different categories 66-70 or 71-73
 
MonkeyTrev said:
That will be plenty for my 360, I’m hoping to make 400hp with it. It’s a long shot, but the block is bored .30 over. I did an at home port job, new isky cam, edelbrock airgap, Hedman headers, windage tray, electric fan, and looking around at electric water pump. I’d love some edelbrock aluminum heads, but the money doesn’t always match the dream.
Click to expand...
Torque converter stall is important. You should decide based on rear gear, tire size, camshaft, weight of vehicle. 65'
 
Plymouth 65 said:
Torque converter stall is important. You should decide based on rear gear, tire size, camshaft, weight of vehicle. 65'
Click to expand...
I was thinking 2,500 stall. It has 3.23 rear gears in it at the moment, but I wanna go to 3.55 or 3.91 in the future. It’s a 65 Barracuda so the weight is pretty light. The rear tires are going to be big meats. About 12 inches wide.
 
I goofed big time, my apologies.

In this sequence;

3632 3258

the 3258 is actually the 3,258th transmission assembled on the date;

3632 - July 8th, 1971 (1972 model year)

So you want parts for a '72.

Sorry for any confusion I may have caused.
 
2500 stall would be the minimum, I would recommend 3000 stall. Not sure what you're cam spec's are and that makes a difference. Also, tire diameter is a factor, not width. 65'
 
Plymouth 65 said:
2500 stall would be the minimum, I would recommend 3000 stall. Not sure what you're cam spec's are and that makes a difference. Also, tire diameter is a factor, not width. 65'
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Diameter is gonna be 27”-29” not 100% sure yet. But the cam specs are .465 Intake/exhaust, ADV duration 270, .050 duration 221, lobe center 108, the isky webpage has it rated 2000-6200 rpm range.
 
MonkeyTrev said:
Diameter is gonna be 27”-29” not 100% sure yet. But the cam specs are .465 Intake/exhaust, ADV duration 270, .050 duration 221, lobe center 108, the isky webpage has it rated 2000-6200 rpm range.
Click to expand...
I believe a 3000 stall wouldn't disappoint! 65'
 
MonkeyTrev said:
Thank you so much for all the tech advice. I’m 17 and learning as I go. Thank you for all the help, really appreciate it.
Click to expand...

Your welcome! Great to see you young guy's n girls interested in building these cars! 65'
 
BTW, don't put too much carb on there. 650 cfm would be fine. 65!
 
Alaskan_TA said:
I goofed big time, my apologies.

In this sequence;

3632 3258

the 3258 is actually the 3,258th transmission assembled on the date;

3632 - July 8th, 1971 (1972 model year)

So you want parts for a '72.

Sorry for any confusion I may have caused.
Click to expand...
Thank you for the help really appreciate it.
 
That 221 cam will make a chitload of bottom end. The more cylinder pressure it makes the more chitload. But with factory iron heads, 400 is outta reach. However, with the right TC it will be a chitload of fun,even with the 3.23s
If your compression tester reads 160 or more,you are in forchitfunforchure. But if you didn't bring the compression ratio along, well then, you'll just need a lot more stall and a bit more gear. Or vice versa. Or a bit-O-both. A static compression ratio target for me wouldabin 9.8, with a tightQ, and a 104 install.That would make a smokin-hot hit off the line, with a 2800.
 
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