Auto trans input shaft/TC hub vs crankshaft register

67dodgedartconv said

Sorry, don't know the correct terms. Yes, the pilot on the tc that fits into the crankshaft register is 1.55 inches in diameter. The crankshaft register is larger at 1.8 plus inches. I still don't know which of the splined shafts in the transmission is the output shaft. The small inner one has 18 and the larger outside one has 27. My transmission is in a 67 dart. Changing engines to one that has a larger crankshaft register so looks like I need a bushing or a 68 on up transmission to make this work or a custom tc?

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67dodgedartconv, in order to address the larger 1.8 crank pilot and small input shaft on the early trans you have 2 options. Option 1, just use a bushing in the 1.8 crank pilot and put the 67 trans and torque converter together. Option 2, have the larger input shaft and clutch drum in the 67 trans replaced. You will need a 68 and up torque converter for this option. I chose option 2 for my build. The main reason was because you're selection of torque converter (stall) will be very limited with the smaller input shaft diameter, even customer built!