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The larger cars like the Polara's usually had the larger 727 tranny in them, not the 904 like was found in the 318 Darts and Dusters.
 

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Aka Force Fed Mopar
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The torque converter won't work, 360 uses a weighted converter. A727 has an ear in the pan where the dipstick goes in, the 904 has a square pan.
 

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Do the trans pans in each car look the same?? Assuming both cars have a 727, then the trans will bolt on no problem. however, as Speed dragon noted the 360 uses a weight welded to the converter to balance the crankshaft. the 318 conveter will bolt on but the engine's main bearings will be trash in 6,000 miles (experience). another consideration is if you are swaping different trannys (904 to 727). the 727 has a longer tailshaft using a shorter driveshaft.

As for the delayed engagement in the morning, its more likley an internal seal failing not the torque converter. That is assuming the fluid level is correct.
 

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Discussion Starter · #9 ·
Tranny swap

Pulled the tranny out of this Polara, turns out to be different (shorter) too bad b/c it was just rebuilt. Picked up an old Fury with the correct different but i have no way to tell of it works b/c the car doesn't run, can a transmission shop bench test it ??
 

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Do It In A Van
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The older TF are slow to engage in the morning because it takes a second or two for the pump to bring pressure up when you put it in gear. TF pumps aren't engaged in Park, but in Neutral and the gears.

Before putting the trans. in gear right off the bat, try letting it idle in Neutral for about 10 seconds and then drop it in gear....see what happens.
 

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4 Wheel Power Disc Brakes
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Some transmission shift kits have a different TC valve that allows the convertor to fill in park. They specify this in there advertising, but I forget who does and doesn't.
As for the shorter tailhousing, It may have the dreaded ball n trunion, sometimes called the detroit bearing. Some A vans had these, most didn't. They did use the same medium length tailhousing and can be converted to U-joint with slip-spline drive shaft. (Been there, done that to an A van) The ball n trunion became harder to find +expensive. It's inferior in strength also.
--B-300--
 
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