Will the flex plate that is on my TC on the 318 work is do I need a different one for the new TC I am trying to get everything I need so I can drop the trans and do everything at one time
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From the factory your 318/727 combo was supplied with a 12" converter. The 340/727 combo was an 11" converter and I think the flex plate is the larger one. I take it the 340 is out, so look at the crank to see if the mounting holes for the flex plate are even or uneven. Is there a flexplate with the 340? If so, and it looks good use it.
If not, then look at the flex plates in the file I sent you. You see that part number 12611 has uneven bolt holes while 12611A has even bolt holes. Don't pay too much attention to the part numbers for application. I know that part numbers 12611 and 12611A say they are for a Torqueflite 6 while part numbers 22611 and 22611A are for the Torqueflite 8, but that isn't necessarily so. What I'd do is know what the mounting holes in the crank look like, order the converter and then get the flex plate, with the proper crank mounting holes, and then match the flex plate to the mounting holes in the converter.
