3 Speed Manual to Automatic Swap

[Ragmanx]

Thinking of swapping the 3 on tree to 904 push button auto. I'm garhering the parts needed.
Question - Does the drive shaft need to shortened?

 

[MidnightSwinger]

No, I believe the 903/833/904 are all the same length.

 

[Professor Fate]

You've got a ball and trunnion output on your 903, and early B&T 904s are a different animal than later 904s (lengthwise).
Best bet is if you find a donor for the trans., pushbutton linkage assemblies (don't forget the dashboard pushbutton trim!) and carb linkage/kickdown pieces; would be to grab the driveshaft too. Just be aware that Valiant/Barracuda is a different length than a Dart, but either a 2 door or a 4 door will work.
Heck, if it's correct (PS or non-PS, they're different lengths) I'd grab the steering column too- that way you can eliminate the column shifter and mounting lug.

 

[WV64Signet]

Too bad you are on the wrong side of the continent.

This is reasonable for the transmission and the pushbutton mechanism (Not mine)

Chrysler Mopar Torqueflite 904 Push Button Trans and Shifter

photos included as some folks don't do marketplace.

If I recall, you are working with a 64 Dart GT.
Can't remember but I think slant 6?

For the 64 year, early A, you need an Early A transmission. The tail housing is shorter than the B body 904

second, the bell housing is different between the Slant 6 and the LA V8.

And if you are sticking with your current prop shaft, should be fine, but also remember that the 64 Dart GT has a 111" wheelbase. The 106" wheelbase Valiant prop shaft is too short.

 

[Ragmanx]

Thank you for the posts & pics.

I have sourced a 904 from a '64 Valiant 2dr. complete with the push bottons & cables.

I quess I'd have to find out if my drive shaft will match up.
Can you guys think of any more hiccups in this transition?

Any thoughts are more than appreciated.
Thank you
Steve

 

[Professor Fate]

Thank you for the posts & pics.

I have sourced a 904 from a '64 Valiant 2dr. complete with the push bottons & cables.

I quess I'd have to find out if my drive shaft will match up.
Can you guys think of any more hiccups in this transition?

Any thoughts are more than appreciated.
Thank you
Steve

As I said, you'll need the kickdown linkage from the carburetor to the transmission.
Also, you'll need a radiator with the transmission cooler fittings; or else plan on installing a separate cooler and retain your current radiator.

 

[WV64Signet]

I quess I'd have to find out if my drive shaft will match up.

Appears to be the same length
From the 64 parts book

Wiring for the neutral safety switch back to the transmission housing.

Transmission cooler lines (transmission with bottom tank mentioned above)

Firewall Grommets for the shift and park cables

 

[Ragmanx]

Thank you all for answering my questions about the swap.

It appears it is doable.

I had a source that said he has a push button 904 tranny with all the parts except the correct radiator with tranny cooler.

But that guy dropped from sight? Who knows what that is all about.

All of your information enables me to do this , and I truly appreciate your time and effort!

Now that I know what is needed, and to be honest, at 80 yrs old, I don't think it's a good idea to pursue this now.
I will man up and keep the 3 on tree for now.

Thank you all for your help, i've learned a lot!

Steve

 

[RustyRatRod]

I have a cable shift, ball and trunnion 904 here, but I'm in Georgia.

 

[go-fish]

@Ragmanx

Here are the Spicer part numbers for the B&T conversion.
Flange​	2-2-349​
U-joint​	5-153x​
Slip yoke	2-3-8001kx​
Spline​	2-40-1711​
Tube​	2 1/2 dia / .083 wall​

This is the parts list for a slip yoke style conversion driveshaft if you find you need to have one put together. I have a 64 Barracuda and will be converting to slip yoke for safety and the availability of the b&t and being harder to service. Apparently, noise vibration, and harshness is reduced too.

 

[RustyRatRod]

Thinking of swapping the 3 on tree to 904 push button auto. I'm garhering the parts needed.
Question - Does the drive shaft need to shortened?

I sent you a private message, but I don't know if you got it. If you have a borg and beck style clutch in it now, you can swap over to a diaphragm style clutch and it will be a good bit easier to operate. Then, all the expense you have is a clutch set and the labor of course. Maybe someone in your area has a diaphragm clutch you could try to see the difference. It can be pretty drastic.

 

[matthon]

Can't a later non-pushbutton trans be installed with an aftermarket floor shift and be done with it?

 

[go-fish]

Can't a later non-pushbutton trans be installed with an aftermarket floor shift and be done with it?

I think he wants to go push button if he changes.

 

[RustyRatRod]

Can't a later non-pushbutton trans be installed with an aftermarket floor shift and be done with it?

Well sure. I get the impression though that he wants it to be as stock as possible.