360/904 question 65 Valiant

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Litz

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I'm in the process of swapping the 65 273/904 in my 65 Valiant for a 73 low mi. 360 that came with a 727. From what I've learned I would be better off with a 904 rather than using the 727. My question is what year 904 trans. should I be looking for to use with the 73 360? I don't want any balance issues. Thanks, Litz
 
Balance problem isn't the trans. It will be the converter. A b&m flexplate will do the trick.

Somewhere in the late 60's they changed the spline count on the 904. Look for a 70-up 904 and you'll be good to go
 
Are you keeping the 65 904? If so use the B & M flexplate and the bushing that goes in the 360 crank pocket for the smaller snout in your 65 converter. If swapping out your 65 904, try to use a 68-up so you don't have to use the bushing
 
Balance problem isn't the trans. It will be the converter. A b&m flexplate will do the trick.

Somewhere in the late 60's they changed the spline count on the 904. Look for a 70-up 904 and you'll be good to go
Thanks for the info. I wonder if anyone would be interested in my 65 cable shifted 904 complete with console?
 
Are you keeping the 65 904? If so use the B & M flexplate and the bushing that goes in the 360 crank pocket for the smaller snout in your 65 converter. If swapping out your 65 904, try to use a 68-up so you don't have to use the bushing
No, going to a later 904.
 
By 71 most of the desireable upgrades were done to the 904, so any 71 up is good. I think almost all the 904 TCs were low stalls tho, so depending on the cam in the 360, that might be a sticking point. Lo-stalls were around 1750 with 2bbl teeners.
But since you already have a 904........
 
727_fig2.jpg
Be careful about going to the much newer 904's. They started going to lock-up converters in the late '70's. Older converters don't interchange with those. They can be recognized by a smooth, machined tip on the shaft.
 
View attachment 1715050618 Be careful about going to the much newer 904's. They started going to lock-up converters in the late '70's. Older converters don't interchange with those. They can be recognized by a smooth, machined tip on the shaft.

Nothing really wrong with lock-up set ups. But it's not performance oriented and converter options are very limited. Good thing is that they also started going to the 2.74 low gear sets. But I don't know if all lock-ups had them or how to tell unless you disassemble it & know what to look for.
 
Thanks for the info. I wonder if anyone would be interested in my 65 cable shifted 904 complete with console?
I would be, but since you are in California, and I am in Texas.......
 
View attachment 1715050618 Be careful about going to the much newer 904's. They started going to lock-up converters in the late '70's. Older converters don't interchange with those. They can be recognized by a smooth, machined tip on the shaft.
How could I find out which year they switched to lock-up converters? I have a good 1973 727 but want to use a 904.
 
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