My four-door 68 Cutlass Supreme Holiday Sedan came with a 350 Rocket, Quadrajet carb and a 2-speed Jetaway. Recently I found a leak with the governor cover seal and attempted to look around for a replacement. I couldn't find a gasket to fit the 3-bolt style pattern cover so I called a transmission parts supplier I found on ebay and asked if he carried it. I told him what I had and he said "They didn't make Jetaways that year. You're gonna have to buy the whole rebuild kit for $89 to get that gasket"

Now I went on google and looked up some info on the transmission (Im still learning here) and I found this and forwarded to him:

The Super Turbine 300 (abbreviated ST-300) was a two-speed automatic transmission built by General Motors. It was used in various Buick, Oldsmobile, and Pontiac models from 1964-1969. It was the same transmission marketed under different brand names by each division including ST-300 by Buick, Jetaway by Olds and simply Automatic by Pontiac. The two-speed Jetaway automatic used in various Buick, Olds and Pontiac intermediate cars from 1964-1969).
The Super Turbine 300 (Jetaway) was introduced for the 1964 model year as a replacement for the earlier Buick Dynaflow and Oldsmobile/Pontiac Roto Hydramatic transmissions. It was the only automatic offered on GM A platform cars (Buick Skylark, Oldsmobile Cutlass, and Pontiac Tempest) through 1966, and was available on the full-sized Buick LeSabre and Oldsmobile Jetstar 88/Delmont 88 as a cheaper alternative to the three-speed Turbo-Hydramatic.


And this was his reply:

"This is Wrong! And if you use this info to order ST-300 parts by calling it a Jetaway you Will order the wrong parts. ST-300 is a ST-300 and it replaced the Jetaway"315" that was used 1958-1964. "


I am not sure which info is correct? From what I see, ST300 looks it has the same style governor cover with three bolts and I managed to find one for $2 shipped. Hopefully it will fit. Thanks.

 

Oldsmobile called their version of the 2-speed ST300 "Jetaway". That's in all the 64-69 factory sales and service literature. Pontiac called their version "Tempest-torque". Only Buick called it Super Turbine 300 (and Super Turbine 400 for the original version of Turbo 400, which was a Buick/Cadillac thing for 1964).

Now- Olds also called their version of the 1956-60 Controlled Coupling 4-Speed Hydra-Matic "Jetaway". That's where yer trans guy is losing his focus. If he's a trans guy he should know that.

And Pontiac called it "Super Hydra-Matic". Only Cadillac called it "Controlled Coupling". Buick being Buick would have nothing to do with a Hydra-Matic- they said it was too jerky for a Buick. Fine for a Cadillac or Rolls Royce, but too jerky for a Buick. I always suspected the real reason they wouldn't use it was because they did not design it.

 

If it looks like this, you'll probably be fine:



Seems to be the same for all 64-69 Super Turbine 300s.

 

Fatsco is a good source for hard to find transmission parts.

http://fatsco.com/

 

Go with Fatsco if you need that particular gasket. Hell, it might even be the same gasket as the TH400's use, even a TH350 governor cover gasket might even work.

The 315 Jetaway (I believe) was called Stratoflight from 56-58, then updated to Super hydramatic as was mentioned. Also mentioned was the "tempest-torque". This can be confusing too, as Pontiac called their version of the Corvair Powerglide, u guessed it, TEMPEST-TORQUE. So there are two TEMPEST-TORQUES.

The ST300 part should work just fine.

 

Thanks for the great info. Ironically enough i ordered a gasket from the same place. Fatsco. I found him on ebay i gave him a call he was nice enough to mail me a gasket all the way here to california. It was only two bucks. Finally, i can take care of the transmission leaking issue.