Can my slant six 3 on the tree be used with 318

AJ/FormS said
That's not a 727,
and it will not fit into your Duster without a lotta lotta work. However;
Once it's in and running, You will be part of an elite group who is extremely satisfied with the result.
What That is , is a Torqueflite overdrive, 4 speed automatic. She works very well with rear gears in the window of 3.91s to 4.30s
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Wow! I had no idea it was an overdrive! I used to drive around the D250 the motor/ trans came out of and never noticed/ realized it had an extra gear....I just assumed by the kick out on the dipstick side that it was 727.....I'll have to compare it to the motor home 727 I have in my garage