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Pontiac of the Month

Debbie Harris's 1969 Grand Prix

2021 October
of the Month

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What a great find. Tell us more!!!!

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Del that is soo cool that you found another trans, like you said, it keeps your 64 on the road while the master is building you a new one! great move mate 🙃:cheers:

and great score to find a builder who knows what he is doing:dancingpontiac:

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So when does the tranny go back in the car?

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hay Del, hows the tri carb set up going ?

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So Del - what is the history of the JETWAY transmission? I have certainly heard of the Dynoflow and the Slim Jim, but a 4-speed automatic back in the early 60s was a pretty amazing piece for the day. I am curious to know more about it and I wonder why GM walked away from it in favor of the Powerglide 2-speed and 350/400 3-speeds for so long. I'm sure cost was a factor - it always is.

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Posted (edited)

Another article explains:The Hydramatic was a complex design that was expensive to produce. Despite some early problems, it was reliable, and so rugged it was widely used in drag racing during the 1960s. It was not as smooth as some competitor's transmissions (notably Buick's Dynaflow), but was more efficient, especially at highway speeds.

 

Here is a video explanation. Go to about 11:30 

 

Edited by Bonneville convertable64
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