[John V.]

In '64, all T/6 & T/8 used the p/n 5679580 driveshaft, automatic, 3 spd & 4 spd according to the '66 MPC.

Only exception was when the Chevy Powerglide automatic was installed in lieu of the Buick Super Turbine automatic. In '64, the air-cooled Powerglide was used as an alternate to the air-cooled Super Turbine in some of the 6 cyl builds. The driveshaft for it used rubber torsional dampeners. Every now and again a Powerglide equipped 6 cyl Tempest turns up but I believe they were not very common. In any event, PMD stopped using the Powerglide for '65.

Not sure how the '65 5695098 driveshaft differed from the 5679580 but it would seem they should both fit. I'm guessing the '65 man trans driveshaft was beefed up in some respect.

The HD 3 spd was the Dearborn trans, obviously required a unique driveshaft.