Drive shaft measurement

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It DOES matter what the wheelbase is. With the same drivetrain, the Dodge will have a longer driveshaft compared to the Plymouth. Yes the engine/trans is in the same position in relationship to the firewall BUT, from there back, the floorpan is longer which in turn moves the rear end farther back. Pull up the back seat on a Dart and you can see where they lengthened the floorpan.

Ok then you measure the wheelbase and pull up the back seat and figure out how long the shaft needs to be.

While you do that and confuse the ever living **** out people on this board that don't know the difference between a 8.75 and dana and 7.2 and 8.2 , let alone if they have a 727 or 904... along with what yahoo made all kinds of half assed backyard bs changes to the car that has had umpteen different asses ruining it over the past 40 years or more...you make sure and use the wheelbase when all you had to say is measure from the trans output to the end yoke on the diff...

Do you see the problems and insanely added detail that people DO NOT NEED to worry about with a wheelbase dimension.




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This thread is much better now.

This message is hidden because Supershafts is on your ignore list.

Have fun bloviator

Wheelbase DOES make a difference regarding driveshafts on an A body car and same drivelines, at least on earth it does. :)

69 Dart 727 with a 8.75 rear
Parts book #2852228 47.81"

Damn I was really close at 47.75 :violent1::violent1::cheers:
 
This thread is much better now.



Have fun bloviator

Wheelbase DOES make a difference regarding driveshafts on an A body car and same drivelines, at least on earth it does. :)

69 Dart 727 with a 8.75 rear
Parts book #2852228 47.81"

Damn I was really close at 47.75 :violent1::violent1::cheers:

Is that center to center crackedback?
 
Is there anyone out there that knows the length of the drive shaft (which I do not have) for my 1968 barracuda 340, 727, 8 3/4 center to center and is there a way to tell just by looking if the yoke is for a 727 ?
 
A 727 yoke is bigger and longer. Usually the splines will be a ways back inside. The 904 almost always has the spline right from the start. Kim
 
Thanks for the reply. There is a guy not to far from me who states that he has a drive shaft from a 1969 Dart that had a 340 and a 727 with the 8 3/4 rear end, but since I have nothing to go by for this 68 Barracuda I am just going to look at un-familiar parts, a length from center to center of the U joints would be help full. NBDART I do not mean to hijack your thread but since the topic is being discussed I hope it works out for anyone else that needs it also.
Thanks
Bob
 
At least any newb who reads this thread will understand that the posters on here are all very concerned about the same thing: It's a lot easier to get the wrong driveshaft than the right one. Someone without driveshaft experience (and who tends to oversimplify things) will end up spending extra money on a driveshaft that doesn't fit their car. But we can't expect a person who doesn't know what type of trans they have or even what type of rear end they have; to have the knowledge and experience enough to figure out where the center of their front u-joint would be if they have no driveshaft whatsoever. If the op measures from the trans rear seal to the back of the u-joint cup, he will begin to have some idea if some random driveshaft will be close enough to consider. The rear seal mark will be on the yoke; just measure from that wear line to the back of the u-joint to compare. Then there's the question of yoke splines...
 
I have absolutely no drive train in my 68 at all other than the 8 3/4. The engine is on the stand in the garage and I haven't even picked up a 727 yet, but if I knew approximately how long the shaft is then I could go over to this guy's house and measure, not that I need it right now but the price is right and I am in my collecting parts mode. I bought this car with no drive train because I have a 340, but right now that's all I have.
Bob
 
Ur Cuda has 108 wheel base right? The 69 dart has 111 so its 3 inches to long for u with the 727 and 8.75? It will be a 7260 u joint size with 340 motor. Kin
 
Ur Cuda has 108 wheel base right? The 69 dart has 111 so its 3 inches to long for u with the 727 and 8.75? It will be a 7260 u joint size with 340 motor. Kim
 
4 year old thread too... :)

@66 CUDA

Using all the factory parts, the 68 cuda. 727 and 8.75 DS should be right at 44.80"

And measurements should be center to center
 
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I have a shaft out of a 71 340 727 8 3/4 Duster that measures 49 1/2" C to C. 7260 front joint and a 7290 rear joint.
 
Maybe out of a 340 3 speed car. That shaft you have is 4.5" longer than the shaft in my 70 340/727/8.75 Duster at 45".

4 Spd cars were 49".

@SGBARRACUDA
 
NpSgCa2.png
 
I am sure once I get the engine and trans in I will find the correct shaft for this car, they seem to be readily available here in the Michigan area.
Thanks for your help and input.
Bob
 
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