MYSTERY DRIVESHAFT.......IS IT THE RIGHT LENGTH?

[CFD244]

Hi Folks

I have a Mopar driveshaft of unknown origin hoping to use it in a 727 and 8 3/4 Demon. With the yoke bottomed in the transmission and the rear axle at full drop (hanging with shocks attached) I have about an inch that I would need to pull it rearward to seat in the diff yoke.....Is this an adequate fit?

Thanks FABO

 

[4mulas]

What is the measurement Center of ujoint to centre of ujoint?

But from the sound of it you’re probably ok.

 

[RustyRatRod]

Sounds about right.

 

[missing linc]

If memory serves, on a 108 inch wheelbase the driveshaft length is 44.375 inches, and the 111 inch wheelbase uses a 48 inch driveshaft. Somewhere I had a chart with the correct length of each application, but I'm at work now and it isn't on my phone.

 

[missing linc]

Found a chart, 70-72 Demon/Duster 340 and 727 uses a 44.99 inch long driveshaft. I was close...
Hope this helps Troy.

 

[Dana67Dart]

Look in the FSM or parts books.

Some have the diameter of the shaft as well.

One of those sources has the engine, diff body combo and length

 

[Oldmanmopar]

Should be about a 1/4 inch off the dust boot that is on the seal, When the car is on the ground.

 

[CFD244]

Found a chart, 70-72 Demon/Duster 340 and 727 uses a 44.99 inch long driveshaft. I was close...
Hope this helps Troy.

This shaft is 1/4 inch longer, but the yoke s 1/4 inch shorter than my original....Both have the same total length but my original is pitted badly. That's why I installed the mystery driveshaft and posted where it ended up.

Should be about a 1/4 inch off the dust boot that is on the seal, When the car is on the ground.

This rear seal has no dust boot as I am accustomed to seeing. Just the seal that came with the kit which is flat.

 

[1MeanA]

I thought the measurement procedure (at least when measuring for a new shaft) was to leave 3/4 to 1 inch gap (weight on rear wheels). This is what I have done in the past.

 

[Oldmanmopar]

This shaft is 1/4 inch longer, but the yoke s 1/4 inch shorter than my original....Both have the same total length but my original is pitted badly. That's why I installed the mystery driveshaft and posted where it ended up.

This rear seal has no dust boot as I am accustomed to seeing. Just the seal that came with the kit which is flat.

The boot is about 1 1/4 inch so you should be good

 

[CFD244]

The boot is about 1 1/4 inch so you should be good

Thanks. Would you recommend getting a seal with a rubber dust boot. The one in there now is brand new with no boot.

 

[Rapid Robert]

I thought the measurement procedure (at least when measuring for a new shaft) was to leave 3/4 to 1 inch gap (weight on rear wheels). This is what I have done in the past.

thats what I thought too. yoke butted into trans/suspension loaded/measure length needed/subtract strong 3/4" to 1"