Race driveshaft measurement questions
#2469328
03/20/18 07:39 PM
03/20/18 07:39 PM
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Joined: Jan 2003
Posts: 11,704
Portage,michigan
B3422W5
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OP
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Hey guys need some help.
I am swapping my 727 out for a 904 here shortly. Have a 69 Dart. Has ladder bar suspension, so not sure the rearend( 8:75/ 489 case) sits exactly where it would have from the factory.
Anyhow, i am hoping to do the swap all in one day for several reasons.
So my thought is to find out if i can what the measurements are supposed to be were one to order a driveshaft for my car the way it came from the factory(340/727) if somebody hopefully has them, then measure what i actually have. If they agree, the rearend is where its supposed to be.
Then knowing that, i can hopefully find measurements for a 904, and order up a driveshaft and have it on hand the day i do the swap
Make sense? If the factory 727 measurements are correct, should be fairly easy to determine what i need measurements wise for the 904. Somebody has probably already done this on here...... i hope
TIA
Last edited by B3422W5; 03/20/18 07:40 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: Race driveshaft measurement questions
[Re: AndyF]
#2469433
03/20/18 11:10 PM
03/20/18 11:10 PM
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Joined: Dec 2004
Posts: 10,551
Rittman Ohio
fourgearsavoy
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Rittman Ohio
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Cass at Doctor Diff can help you out. He has a form on his website for the Strange driveshafts.  I used the Strange order form and it came out perfect with nice solid 1350 joints and a new slip yoke. Gus 
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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Re: Race driveshaft measurement questions
[Re: B3422W5]
#2469646
03/21/18 12:20 PM
03/21/18 12:20 PM
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Joined: Jan 2003
Posts: 11,704
Portage,michigan
B3422W5
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OP
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Think people missunderstood what i need.
I know the different driveshaft makers have measurement charts.
What i need are those measurements someone has taken for a car with 727 and 8.75 using a 69 Dart or equalivent.
I can then compare that to my actual measurements, to make sure my rear is in stock location.
Knowing that, i can then hopefully get 904 measurements as well, without having to actually put the 904 in the car and have it sit while i order a driveshaft.
I want to order my 904 shaft ahead of time for the swap in other words, and if everything is in stock locations, others must have taken these measurements already that i can use to order from
Last edited by B3422W5; 03/21/18 12:25 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: Race driveshaft measurement questions
[Re: B3422W5]
#2469750
03/21/18 03:24 PM
03/21/18 03:24 PM
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Joined: Jan 2003
Posts: 11,704
Portage,michigan
B3422W5
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OP
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Got what i was looking for from posting same thing on another site
69 Dart with v8 and 727........ 47.81 inches center of yoke to center of yoke
69 Dart with v8 and 904.........52.27 inches center of yoke to center of yoke
So now if the 727 in my car is the same 47.81 inch measurement, i can add the extra length of the 904 measurement on an order a 904 driveshaft with very good chance it will fit as it should. That way i can have everything on hand to do the swap without waiting to order stuff.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: Race driveshaft measurement questions
[Re: B3422W5]
#2469827
03/21/18 05:38 PM
03/21/18 05:38 PM
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Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61
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Don who are you going to have do your new shaft? When I mini tubbed my dart I had Dynotech build me a nice shaft with 1350 u joints. The car has always had a vibration since. I thought maybe my pinion angle or drive line angles were off and over the course of several years tried different angles but nothing helped.
I've been working on the car for a couple months changing a few things and had the transmission out, while it was out I decided to have my local drive shaft builder check my Dynotech shaft for balance. It was way out, he said he thought it was going to jump out of the machine. He added a big weight on each end to balance it, when I went to pick up he ran it in his balancer and showed me the indicators and there was very little movement on either end.
It may just be a fluke but IIRC that shaft was well over $400 and has caused me much grief and wasted time chasing my tail.
BTW, I haven't ran it yet and and will not until I get this brake pressure figured out.
Last edited by justinp61; 03/21/18 05:40 PM.
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Re: Race driveshaft measurement questions
[Re: justinp61]
#2469942
03/21/18 08:02 PM
03/21/18 08:02 PM
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Joined: Jan 2003
Posts: 11,704
Portage,michigan
B3422W5
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 11,704
Portage,michigan
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Don who are you going to have do your new shaft? When I mini tubbed my dart I had Dynotech build me a nice shaft with 1350 u joints. The car has always had a vibration since. I thought maybe my pinion angle or drive line angles were off and over the course of several years tried different angles but nothing helped.
I've been working on the car for a couple months changing a few things and had the transmission out, while it was out I decided to have my local drive shaft builder check my Dynotech shaft for balance. It was way out, he said he thought it was going to jump out of the machine. He added a big weight on each end to balance it, when I went to pick up he ran it in his balancer and showed me the indicators and there was very little movement on either end.
It may just be a fluke but IIRC that shaft was well over $400 and has caused me much grief and wasted time chasing my tail.
Gonna have a local outfit do a steel one. They built one for member scottb( my local buddy) and he went 9.40’s with 1.2xx 60 foots in his 68 r5p7 Dart with zero issues. Should be fine for my pooch
BTW, I haven't ran it yet and and will not until I get this brake pressure figured out.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: Race driveshaft measurement questions
[Re: Racer33]
#2469944
03/21/18 08:03 PM
03/21/18 08:03 PM
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Joined: Jan 2003
Posts: 11,704
Portage,michigan
B3422W5
OP
I Live Here
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OP
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Joined: Jan 2003
Posts: 11,704
Portage,michigan
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If you chart is correct assuming the same rear end in both the 904 and 727 cars you should be able to just order a driveshaft that is 4.46" longer then your existing driveshaft even if your axle is not in the stock location Yep. Exactly my plan..... just do a couple of measurements to verify
Last edited by B3422W5; 03/21/18 08:09 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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