The Dodge Challenger Message Board

The remanufactured 727 I just got has a 10" tourque converter in it. The bolt pattern on the 904 flex plate will not line up no matter which way I turn it. Is there any differences in 10" flex plates at any point of production (symetrical vs. offset?)

As far as i know, you need a flexplate for a 727, most 904s used 11" converters while 727s used 10", the bolt pattern is also differnt i think.

There are for the TF series of transmissions 4 different flex plates made.
11" OD WITH UNEVEN CRANK SHAFT MOUNTING holes
11" OD WITH EVEN CRANK SHAFT MOUNTING holes

12" OD WITH UNEVEN CRANK SHAFT MOUNTING holes
12" OD WITH EVEN CRANK SHAFT MOUNTING holes

Chrysler used both series of flex plates. If the car came with an 11" converter (either 904 or 727) they used the 11" flex plate, and if it was a 12" converter they would use the 12" flex plate.

From what I'm reading in your post you're having a problem mounting your flex plate to the crank. See the above and get the flex plate with the correct bolt pattern that your crank has.

I don't know what after market converter you've got, but we typically at our place we build our converters with the flex plate muounting pattern for the 11" size.

Hope this helps.

Transman

Thanks all. My biggest problem is the engine that was in the car was a 273 - I replaced it with a 318 that came engine only, than bought a remanufactured 727 to replace the 904. Parts I had access to were off of 318's but that was about all I knew.

I will be pulling a 727 out of a parts car I just got a hold of. Hopefully I will get a good look at what I need and how it goes together. This has been my first experience with transmissions other than the occasional filter change and a clutch or two on a.....(Mustang ) I have improved my car tastes since.

Thanks much,
Dale Walker

Why put a 727 behind a 318???? It will just soak up more power. The lighter 904 will live behind even a 'hot' 318 and not use up so much power.

Believe it or not, the remanufactured 727 I got cost me the same as a 904. A number of folks talked me into it, saying the 727 was a better tranny. Better - maybe, but now I wish I had stuck with a 904 and the conversion would have not been an issue. Oh well, live and learn.

By the way, the car I just tried to scarf parts off of had a 904 in it, not a 727. Luckily it was a no-cost parts car, just the waste of time getting it. Back to parts shopping!

-Dale

The 727 isn't better. Just stronger. But stronger also means heavier and it takes more energy to drive. This is why serious racers use the 904. Of course the 904s they use are much modigied and strengthend and cost a fortune!

The 727 is a good investment however if you ever swap out that 318 for a 340 or 360.

I finally got a hold of a flex plate that fit. The flex plate I had must have been off of something else or had some problem. The new one bolted up nicely. Now I have a new problem with some linkage. Am posting a new question.

-Dale