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Is 2 inches of spline engagement enough?

64SF

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Am converting my 64 SF from the flange/trunnion 4 speed to the later model slip yoke transmission. Picked up the newly built driveshaft, installed it and it appears I have only about 2 inches of spine engagement with the yoke and output shaft of the transmission.
I had measured the length as directed by the driveshaft builder. I have about 2 1/2 inches of the yoke shaft exposed between the rear seal and the yoke/u-joint. Looks to me like the driveshaft needs to be at least an inch longer. Thoughts?
 
I'm not expert, but yes, I think you need it an inch longer (sorry). I ran a car with the front yoke sticking out that far & it was fine for a while, then it developed a nasty vibration and chewed up the tailshaft bushing/seal.
 
I'm not expert, but yes, I think you need it an inch longer (sorry). I ran a car with the front yoke sticking out that far & it was fine for a while, then it developed a nasty vibration and chewed up the tailshaft bushing/seal.
This^^^^^
 
tb1.jpg
transt.jpg
I'm sure you need at least 3 inches, driveshaft to short you'll be doing this. Trans bushing removal and install tool, $135.
 
I'm not expert, but yes, I think you need it an inch longer (sorry). I ran a car with the front yoke sticking out that far & it was fine for a while, then it developed a nasty vibration and chewed up the tailshaft bushing/seal.

I’m taking the shaft back and having it redone....haven’t run it yet and don’t even want to think abt replacing that bushing.
 
Really depends as you go over bumps it will go in and go out. I have a question is she large? If so she will not mind.

foghorn-leghorn.gif
 
Am converting my 64 SF from the flange/trunnion 4 speed to the later model slip yoke transmission. Picked up the newly built driveshaft, installed it and it appears I have only about 2 inches of spine engagement with the yoke and output shaft of the transmission.
I had measured the length as directed by the driveshaft builder. I have about 2 1/2 inches of the yoke shaft exposed between the rear seal and the yoke/u-joint. Looks to me like the driveshaft needs to be at least an inch longer. Thoughts?

Is this with all four on the ground, not rear axle suspended?
 
Is this with all four on the ground, not rear axle suspended?

All four on the ground. Took the shaft back to the shop and they are making it an inch and a half longer. This will put it right where it needs to be.
 
This diagram shows the slip yoke location dimension, subtract D from E.

manual trans.jpg
 
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