Driveshaft specs needed

[bmoparmofo]

Hi, just wonderd if anyone has the specs for a driveshaft for a 69 charger, 383/727 8 3/4 set up, I am trying to buy a used one if anyone has one or knows of where to get one.I have nothing to measure as my car was missing it before I got it. Thanks.

[Ghoste]

Slightly over 52 inches (52.07).

[bmoparmofo]

Thanks,any idea on the difference in diameter for the big block driveshaft?Not sure if there are availible new or should I just keep hunting? Thanks for the info again!

[Ghoste]

Diameter for all the big block cars is 3 inches as far as I know.  As for a new one, no dice, however you can get a new one made at a number of places.  If there isn't a driveshaft specialty place in your hometown, it shouldn't be too hard to find one someplace else that can do it.

[bmoparmofo]

I have found someone with a driveshaft from a 440 / 727 8 3/4 set up. The measurement is different than what the specs call for. Unfortunately I dont have the engine and transmission in my car to measure it. The measurement he came up with is From end to end (not counting the trans yoke), it measures 52-3/4" inches.Another measurement he came up with is
From the CENTER of one u-joint hole to the CENTER of the other, it measures 51-1/4" inches.
Does anyone have one they could measure for me? Any insight? Thanks for any help.

[dspaulding70]

I have a 70 Charger that I just changed out the 318 engine, 904 transmission and rear end with a 440/727/ 8 3/4 rear.  Can I use the same driveshaft and have it shortened by a local shop?  I do not know if there was a different diameter driveshaft for the 440's.  Please advise.

Darrell

[bmoparmofo]

From what the book says regarding diameter..the 440 driveshaft should be 3" diameter. Still trying to figure out my driveshaft dilema as well..

[Just 6T9 CHGR]

As far as I know, as per the 69 FSM,  you are correct with the 52.07" length measured from the center line of the front yoke joint hole to the center line of the rear joint hole.  This is the measurement for a 318 all the way to a 440 with a 727 & 8-3/4 rear.  They are all 3" in diameter as well.  They all should have the large inertia ring welded to the front of the shaft as well...
Now will 3/4" make a difference?  I think not since the slip yoke in the front will take up a 3/4" difference no problem.....your call

[Just 6T9 CHGR]

I have a 70 Charger that I just changed out the 318 engine, 904 transmission and rear end with a 440/727/ 8 3/4 rear.  Can I use the same driveshaft and have it shortened by a local shop?  I do not know if there was a different diameter driveshaft for the 440's.  Please advise.

Darrell

Darrell in your case, assuming 69 is the same as 70, which it should be, your orig 904 shaft will be too long in this case...56.17"
You will have to shorten it or get a new shaft made up....I'd go with the latter.  Chasing driveline vibes aint fun....trust me

[bmoparmofo]

Anyone have a pic of the inertia ring? I dont see one in the pics I was sent.Not sure of what I'm exactly looking for though.What will happen if I use one without the ring? Thanks again.

[Just 6T9 CHGR]

From the 69 FSM

Do you need it?  Not really.  My new driveshaft I had made up does not have it

[bmoparmofo]

Thanks, I appreciate it. I think I'll go ahead and purchase it. It sounds like it should work out.

[Chatt69chgr]

The driveshafts for the small block chargers using the 904 transmission and 8-1/4 rear end were about 4 inches longer than for the same car with a big block.  Some 69's came with 8-3/4 rear ends and some came with 8-1/4 rear ends.  The distance from the centerline of the rear axle to the centerline of the differential yoke is slightly longer on the 8-3/4 which would cause the driveshaft to be slightly shorter for cars so equipped.  I do believe that the correct dimension for the big block driveshaft using the 8-3/4 rear end stated is 52.07 inches as stated above and that they were 3 inches in diameter. 

As for the inertial ring---------I don't know why it was used---but apparently it was.  I would like to know if anyone really knows why.  It would increase the mass of the driveshaft.  I wonder if it had to do with the automatic transmission.  I talked to a place here locally that makes driveshafts and they told me that they usually make them now using 3-1/4 inch diameter stock.  I think this would be better as it would be stronger.  And they don't have a inertia ring.  I am thinking that you don't have to have this.  I suppose if you were doing a numbers matching resto then you would want to find one of these old driveshafts and have it balanced for reuse.  Otherwise, get a new one made.

[Back N Black]

The inertia ring was used on 440 4 speed car, the auto's did not have them. I'm not 100% on that, read it somewhere awhile back.

[Just 6T9 CHGR]

The inertia ring was used on 440 4 speed car, the auto's did not have them. I'm not 100% on that, read it somewhere awhile back.

They all had them...My 440 R/T auto had it

[firefighter3931]

The inertia ring was used on 440 4 speed car, the auto's did not have them. I'm not 100% on that, read it somewhere awhile back.

They all had them...My 440 R/T auto had it

My 68 was originally a 383/727 car and it also had the inertia ring welded on. 



Ron

[bmoparmofo]

Hey gang, More questions...The shaft I'm looking at getting is measuring 51 1/4 center to center, 3.25 in diameter, partnumbers that can be found on it or the yoke are 2781928 and 2883730. I dont see those numbers in my interchange book. Anyone have a book that lists these? If anyone has access to their driveshaft, is it possible to take a measurment? I just want to make sure this is going to work out since the book is calling for 52.07 with a diameter of 3" . Thanks again for any input or help!

[bill440rt]

Hey guys,
bmoparmofo & I have been going back and forth on this driveshaft thing. This one came out of my '69 (aka "Project '69"). Car was originally a 383 4-spd, then converted to a 440-auto. This was the driveshaft that came with the car.

From center of one u-joint hole to the center of the other, it measures 51-1/4". Driveshaft is 3-1/4" in diameter. No inertia ring.

I don't think 3/4" would make a difference, either. But, I don't want to sell bmoparmofo something that wouldn't work or he'd be unhappy with. I was going to put it back in my '69, so it's been sandblasted & epoxy primed. However, that was before I decided to go auto-OD, so I no longer need it.

Any answers?

[Ghoste]

The inertia ring was used on 440 4 speed car, the auto's did not have them. I'm not 100% on that, read it somewhere awhile back.

They all had them...My 440 R/T auto had it

My 68 was originally a 383/727 car and it also had the inertia ring welded on. 



Ron

Ditto my 67 383 auto.  I think we can dispel that one.

[bmoparmofo]

Anybody know if there is anywhere online to look up these part numbers?

[Ghoste]

The driveshaft part number for your car in 1969 was 2660635 with a 7260 u joint.

[bill440rt]

The driveshaft part number for your car in 1969 was 2660635 with a 7260 u joint.

I believe the 383 2-bbl cars had the smaller 7260 u-joints. 383 4-bbl cars should have had driveshafts with the larger 7290 u-joints. 

[Ghoste]

If its 7290 then the number is 2852 162.

[Iowa_Mopar]

Hey gang, More questions...The shaft I'm looking at getting is measuring 51 1/4 center to center, 3.25 in diameter, partnumbers that can be found on it or the yoke are 2781928 and 2883730. I dont see those numbers in my interchange book. Anyone have a book that lists these? If anyone has access to their driveshaft, is it possible to take a measurment? I just want to make sure this is going to work out since the book is calling for 52.07 with a diameter of 3" . Thanks again for any input or help!

Here's the specs from a charger restoration guide.