1972 Polara 360 w 904 to 727 shift linkage and question

[72polarbear]

Driving back home late the 904 that’s paired to my 360 wouldn’t want to shift out of first and left a trail on fluid from a leak on the main seal caused from what I assume is the flexplate pushing the tq into it and bending the seal in. I have a spare 360 with a 727 from a 4 Door 72 Polara and since i have the 904 out I figured I might aswell send the 727 to get rebuilt and replace. But I have a few questions:
1: is the shift linkage the same? The 727’s linkage was removed before I bought it so what would I buy instead?

2:do I need to swap the flexplate to something else or and is there anything Different when mounting up

3: since I’d need a shorter driveshaft because the 727 is longer, could the one from the 4 door work? The original is 67 3/4 in from tip to end and the 4 door’s 62 7/8 in. I know I need the use the yoke since the 727 and the 904 is different.

Apologies for the long paragraphs, any help is greatly appreciated, this is all new to me.

 

[MONC440]

The linkage should be the same. Flex plate will depend on what TC you are using. If the driveshaft is out of a 4 door with the 727 and is the same body style of yours you should be all set 2 door and 4 door are the same.

 

[Fury1969WI]

Driving back home late the 904 that’s paired to my 360 wouldn’t want to shift out of first and left a trail on fluid from a leak on the main seal caused from what I assume is the flexplate pushing the tq into it and bending the seal in. I have a spare 360 with a 727 from a 4 Door 72 Polara and since i have the 904 out I figured I might aswell send the 727 to get rebuilt and replace. But I have a few questions:
1: is the shift linkage the same? The 727’s linkage was removed before I bought it so what would I buy instead?

2:do I need to swap the flexplate to something else or and is there anything Different when mounting up

3: since I’d need a shorter driveshaft because the 727 is longer, could the one from the 4 door work? The original is 67 3/4 in from tip to end and the 4 door’s 62 7/8 in. I know I need the use the yoke since the 727 and the 904 is different.

Apologies for the long paragraphs, any help is greatly appreciated, this is all new to me.

a) i didn't realize Chrysler put 904s behind 360s, ever.
b) why do you think the TC is "pushing the seal in?" unless someone forced something together upon assembly that seems unlikely. What does that TC hub and seal look like now that you have it apart?
c) agree on going to a 727 on a street car

To your questions;

1) My experience is with column shift cars. When i went to a 727 from a 904 in my 69 Fury, again, column shift, i had to shorten the main pivot rod. That rod is longer for 904s in order to reach the narrower case. Everything else is the same so you should be good do go assuming you are talking column shift
2) 360 is externally balanced. TC should have the weight(s). Otherwise you can get a specific flex plate and run TC without the weights, opening up a world of TCs
3) Just measure the 904 next to the 727 and subtract that from your original driveshaft ... assuming that fit correctly. I'm sure you could google for teh answer but if they're right there on the floor, I mean...

Good luck!

 

[72polarbear]

a) i didn't realize Chrysler put 904s behind 360s, ever.
b) why do you think the TC is "pushing the seal in?" unless someone forced something together upon assembly that seems unlikely. What does that TC hub and seal look like now that you have it apart?
c) agree on going to a 727 on a street car

To your questions;

1) My experience is with column shift cars. When i went to a 727 from a 904 in my 69 Fury, again, column shift, i had to shorten the main pivot rod. That rod is longer for 904s in order to reach the narrower case. Everything else is the same so you should be good do go assuming you are talking column shift
2) 360 is externally balanced. TC should have the weight(s). Otherwise you can get a specific flex plate and run TC without the weights, opening up a world of TCs
3) Just measure the 904 next to the 727 and subtract that from your original driveshaft ... assuming that fit correctly. I'm sure you could google for teh answer but if they're right there on the floor, I mean...

Good luck!

The car was originally a 318 but one of the previous owners swapped a 360 but I can assume the transmission was kept, which now leaves me here. What would you recommend for torque converters and flex plates or where should I look for advice? If the body length is the same I think I can use the 727s drive shaft since I’d need the yoke.

 

[MONC440]

The car was originally a 318 but one of the previous owners swapped a 360 but I can assume the transmission was kept, which now leaves me here. What would you recommend for torque converters and flex plates or where should I look for advice? If the body length is the same I think I can use the 727s drive shaft since I’d need the yoke.

In the 70’s Mopar used 904’s behind 360’s. I had a 76 charger with one. Yes you can use the 4 door driveshaft from the 4 door car if they are the same body style. I would use a stock truck TC, they are a little higher stall and cheap in comparison to aftermarket. Just make sure you get the 360 one with the weight on it.

 

[Fury1969WI]

The car was originally a 318 but one of the previous owners swapped a 360 but I can assume the transmission was kept, which now leaves me here. What would you recommend for torque converters and flex plates or where should I look for advice? If the body length is the same I think I can use the 727s drive shaft since I’d need the yoke.

are you "assuming" you had a 904 or do you know that for certain? based on info at Summit Racing (link below) the 727 driveshaft in the same wheelbase would be 4.375" shorter. Summit is also a good source for flex plates and TCs (also: See Mancini Racing for Mopar specific expertise and if money isn't a problem actually talk to a TC shop about what you are trying to build and they will consider a bunch of factors for you).

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