2024 Canadian Poncho Calendars are Now Available! CLICK HERE

 

 

Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: Driveshaft length question


Addicted!

Status: Offline
Posts: 497
Date:
Driveshaft length question


If the factory produced 2 67 B body cars

and car 1 had a 283 power glide and a 10 bolt rear axle

and car 2 had a 327 power glide and a 12 bolt rear axle

are the driveshafts the EXACT same length?

or is 12 bolt car slightly shorter?

thanks 



__________________

67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 



A Poncho Legend!

Status: Offline
Posts: 48634
Date:

They are the same length BUT be aware there are 2 different styles of u joints, inside snap ring or outside snap ring. That means the driveshafts won't interchange unless the matching yoke on the differential is used.

And also of course a TH400 uses a different yoke in the back of the trans vs. Powerglide or manual transmissions.

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars



Addicted!

Status: Offline
Posts: 497
Date:

Ok well that is a great answer but it doesnt help my situation! Lol!

my driveshaft WILL squeeze into place  BUT it is tight going in!

I was thinking maybe in the cars history the wrong driveshaft was switched or something like that?

Anyone know the factory length?



__________________

67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 



A Poncho Legend!

Status: Offline
Posts: 48634
Date:

Will the front yoke slide all the way into the trans and bottom out?

I had one years ago that I fought and fought with. Finally figured out the splines actually had a twist in them quite a distance into the yoke and that was the issue. It wouldn't bottom out in the tailhousing on the trans.

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars



Uber Guru

Status: Offline
Posts: 3986
Date:

You are going to need an inch or two of extra space on the input shaft. It will float in and out as the the rear suspension travels up and down.

__________________

Remember Fun,

 Remember Laughter ?



Addicted!

Status: Offline
Posts: 308
Date:

My 2 cents worth ,  worked for all my projects 

Take your car and put it into a hoist with the rear differential hanging freely

Next, place the tail shaft into the transmission without a U joint in it 

Next measure depth to ensure it will bottom out,  once verified, pull the tail shaft out of transmission 3/4 to 1 inch, and leave it there, markit with masking tape or something like that.

Next measure the distance between the center of where the  U joint caps would be  , You have to visualize the center points both on the tail shaft and the differential. Would help if you had a buddy to help with this. 

Once you have this measurement, mark it down , then check to make sure the tail shaft is still 3/4 to 1 " from bottoming out into the transmission. 

Next comes the hard part, you have to lower the car and put the weight of the car on the rear differential and front end.  

Well , if you successfully did lower the car and put it's weight on the differential and front end, repeat the measurements taken from the center of the U joint cups. 

From my history, there should be about 1/2" to 3/4 "  less , if this is the case , what I have done on projects is I push the tail shaft into the back of the transmission about 1/4" to allow 3/4" to reach bottom , then remeasure from center of cups to find your true length of the drive shaft.  

This process has worked for me on a few occasions, it make not be the only or for that matter the correct way, but it worked 

Good luck , 



__________________

New Brunswick , 1950 Pontiac Silver Streak 2 Dr Sedan, 1967 Beaumont, 1985 Sierra 1500 One Owner



Uber Guru

Status: Offline
Posts: 3986
Date:

That sounds very logical. Ill do that on the next project.

__________________

Remember Fun,

 Remember Laughter ?

Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.