1957 Dynaflow Trans into a 1958 Buick

[Guest OLDSWAG]

Hi guys just wondering what has to be done to a 1957 Dynaflow Transmission  to fit into a 1958 Buick with a 364 Nailhead..or will it fit with no modifications..thankyou..

[dei]

Meant to respond earlier but on the go right now.

I have it on good authority that yes they will interchange.

If you want a verbal confirmation talk to Jim Hughes in Ohio as he rebuilds only Dynaflows so he would know.

[lancemb]

Only difference is the splines on the yoke.  58 has a keyway I believe and 57 doesn't.  Swap that and you should be all good.

[dei]

That's good to know Lance.

Will be mentioning that to Jim Hughes when he goes over mine.

[RivNut]

Buick transmissiions: edited for brevity

 

1956 Redesign

In 1956 a second stator was designed into the torque converter at the outer diameter of the turbines. This provided at Stall Ratio of 3.5:1 making the performance comparable to other automatic transmissions of the time. This design continued until the end of production of the Twin Turbine Drive in 1963. However, the Triple Turbine ended production in the end of the 1960 model year, leaving the original Dynaflow Twin Turbine the only automatic available in full-size Buicks.

1958 redesign

A final version appeared in 1958 incorporating three turbines that Buick named the "Flight Pitch Dynaflow". Buick made this transmission standard on its top of the line Roadmaster 75 and Limited models and optional on all others. This version was further refined for 1959 and renamed the "Triple Turbine" but was offered only as an option on all models (Buick dropped the "Dynaflow" name after 1958). This unit was similar to the Twin Turbine, but bore some operational differences, amongst them a variable pitch stator that increased converter's torque multiplication to 3:1

[Guest OLDSWAG]

17 hours ago, lancemb said:

Only difference is the splines on the yoke.  58 has a keyway I believe and 57 doesn't.  Swap that and you should be all good.

Good to know buddy ...thanks

[NTX5467]

What about floorpan clearance?  In "the trans hump" area and rearward?

 

Ed, where can the non-condensed version of your noted text be found?  A chronicle of what changes were made when?

 

Thanks,

NTX5467

[lancemb]

57 and 58 2T trans are dimensionally the same.   I'm about to put a 58 trans in my 57 in fact.

Edited October 8, 2017 by lancemb (see edit history)

[RivNut]

1 hour ago, NTX5467 said:

What about floorpan clearance?  In "the trans hump" area and rearward?

 

Ed, where can the non-condensed version of your noted text be found?  A chronicle of what changes were made when?

 

Thanks,

NTX5467

That was a couple of days ago but I think it may have been on Wikipedia. I don't trust them to be 100 per cent accurate on details, but for general information it's not far off.