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Discussion Starter · #1 ·
i have a built and balanced 304 and i am botling a tf 727 to it... however, the only engine that ever had a tf 727 (jeep bolt pattern) was a 360... the 360 is externally balanced and the flywheel has a weight welded to it. can i just order a flywheel for an early 80's cj-7 that had a tf 904 or 999 and bolt that into my 727?

~~Elusive~~
it's sort of still a cj thingy....
 

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there may have been some AMC cars with a 304/290 and a 727 tranny..
and I know plenty of 401 powered AMC cars had Tf727 trannys

BUT since a 304, and a 360 share the same crank and rods, I would bet a flexplate from any 80s Grand Wag with a 360 would be the right balance fora 304 and a tf727..

completely speculation


OzarkJeep
In need of a T18 tranny!
 

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Discussion Starter · #3 ·
i don't think so ozark.. again, i could be wrong, but if the 360 is externally balanced and the 304 is internally balanced, the flywheels would be different.. i am hoping the 904 flywheel is the same as the 727.. i ordered one.. it'll be here tuesday.. i'll see!

~~Elusive~~
it's sort of still a cj thingy....
 

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yeah, your wrong, all AMC V8s are externally balanced
keep reading, youll figure it out


OzarkJeep
In need of a T18 tranny!
 
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to the best of my knowledge all AMC engines(290,304,343,360,390,401) are externally balanced!The flywheels/flexplates have counterweights that are specific to that engine.The flywheels are physically changeable but the engine will no longer be in balance if used

JF1
 

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one thing to kep in mind here, flexplates weigh lots less than flywheels, so they may be more forgiving of mis matching, especilliay on a balanced engine.

when you use the term flywheel and actually mean flexplate, it makes it confusing..


OzarkJeep
In need of a T18 tranny!
 

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um... 258, 304's are internally balanced.. and there flywheels and flexplates are nuetrally balanced... were as the others are externally balanced.. meaning they have wieghts on them.. (atleast that is what i have learned in the past few days here) he just wants to know if a tf904 or999 will fit with a tf727.. meaning again.. will the torque converter bolt up?

survival is instinct, but living takes guts
 

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check out the 4wdhardware catalog differnt part numbers for the 258/304 flexplates

727 converters have 4 bolts, not in a square pattern ( although its really close, and looks square, but the flexplate only fits one way)

Ive never messed with a 904 so I cant say, but I would speculate its 4 bolts also


OzarkJeep
In need of a T18 tranny!
 
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You will need a flexplate for a 304, the counterweight is different than the 360 or the 258. The 904 and 727 flexplates are the same. The torque converters are different but the bolt pattern to the flexplate is the same. When your engine was balanced, they should have requested that you bring in the flexplate/flywheel to assure a proper job, at that time a 258 or 360 flexplate could be reballanced to work. A new flexplate is under $50 at your local trans parts supplier. Hope this helps!

 

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Discussion Starter · #10 ·
i did get the flexplate balanced for the engine, even though i was running a manual, i did it just in case i ever wanted an automatic, unfortunately, the one i got balanced was for a th 400

~~Elusive~~
it's sort of still a cj thingy....
 
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