I guess the 'convertible' aspect is irrelevant, but can someone advise what trans the above car would have come from the factory with ?

Motor is 350 4 bbl

 

i believe it came with the Jetaway 2 speed automatic

 

thanks...am not familiar with that. Is it a perfectly good, reliable trans ?

 

They are reliable but are only a two speed.

 

With a 2.78 rear and stock tires they shift out of first at 72 mph

 

aren't all the jetaway transes also switch pitch?

 

A 350 4 barrel RPO Cutlass could have had sevaral transmissions to choose from depending what options it had, as some options required manditory items. I beleive the M31(2 speed) was the standard trans if no options were checked off? Stick shifts were a popular upgrade to a 3 or 4 speed stick, though very rare. The 6 cylinder cars had either the M11 (3 on the tree) or the M31. But I've seen exceptions to these rules too such as a 3 speed stick equipped 6 cylinder convertible.
And no not all jetaways were switch pitches. One way to ID one is to look for a 2 spade electrical connector on the trans which would control the converter vanes though this is not always definitive. The best way is to look at the converter.

 

I might be wrong but I don't think there was an M38 option in 68, only M40 (TH400)

 

Mike,
Yes, I stand corrected 1969 was the first year for the TH350 not 68. The TH350 took the place of the M-31 (2 speed)