833 tailshaft swap

[Garand-chan]

Depends what your purpose is. Ball and trunion parts may be hard to find and they are also not the strongest set up. If you go that route you can convert to the slip yoke setup like a 4x4 front driveshaft.

If you have to have a new driveshaft made anyway going to the slip yoke then might as well make a new driveshaft that uses the drive flange on the ball and trunion. Spicer makes the adapter I believe. Any driveline shop should be able to make this happen.

And here it is
https://www.amazon.com/Spicer-2-2-349-Flange-Yoke/dp/B00GAPJQC2

Then get the U joint and the slip yoke setup. Your drive shaft will look like this
View attachment 1058199

With that adapter, couldn’t I just bolt that to the tranny, possibly shorten the driveshaft if I have to, then connect the two? Possibly a stupid question.

 

[Meep-Meep]

With that adapter, couldn’t I just bolt that to the tranny, possibly shorten the driveshaft if I have to, then connect the two? Possibly a stupid question.

Exactly. Just put the tranny in. But make careful measurements so the driveshaft is made correctly. The driveshaft shop will tell you how to measure it.

 

[Runcharger]

Do you have a driveshaft for a 727 in your car now? If so I would spend the $$$ to make the 4 speed work with it so you have a stock combination (which would involve converting your 4 speed to a slip yoke B-body). If you don't have a 727 driveshaft (either no driveshaft or a 904 driveshaft) then you do whatever for the $$$.

 

[Garand-chan]

Do you have a driveshaft for a 727 in your car now? If so I would spend the $$$ to make the 4 speed work with it so you have a stock combination (which would involve converting your 4 speed to a slip yoke B-body). If you don't have a 727 driveshaft (either no driveshaft or a 904 driveshaft) then you do whatever for the $$$.

It’s a 904.

 

[Garand-chan]

Exactly. Just put the tranny in. But make careful measurements so the driveshaft is made correctly. The driveshaft shop will tell you how to measure it.

Bruh thank you so much. That’s certainly what I’ll do then. I’m glad you all are so helpful and nice rather than judgy. For the most part.

 

[MCODECUDA]

You still need to have a driveshaft like this in order to make it work.

 

[Garand-chan]

You still need to have a driveshaft like this in order to make it work.

View attachment 1058338

Probably a dumb question, but why?

 

[MCODECUDA]

Probably a dumb question, but why?

Something has to compensate for the rear end going up and down as the distance between the rear end yoke and the end of the transmission changes. That is the function of a slip joint or when applicable the ball & trunion.

 

[Garand-chan]

Something has to compensate for the rear end going up and down as the distance between the rear end yoke and the end of the transmission changes. That is the function of a slip joint or when applicable the ball & trunion.

Huh. I figured that if I used an adapter on the trans, it would effectively create a complete slip joint, wouldn’t it? Also, the driveshaft pictured is obviously a Dennys unit, but exactly what driveshaft of theirs would I need? Like what’s different about it compared to the one I have? Apologies for my ignorance.