Driveshaft is 56.5 inches? - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 17 (permalink) Old Apr 6th, 20, 10:04 PM Thread Starter
 
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Arrow Driveshaft is 56.5 inches?

I have a 68 Chevelle that had a Saginaw and 12 bolt in it. Just swapped in an Autogear M22 from 5speeds.com.
My current driveshaft from the Saginaw measures 56.5 inches center to center and I had to do everything I could to jam it in so I could drive home. The slip yoke is completely bottomed out and can only get it on the pinion yoke with mildly excessive force. .
My question is, do I need a 55.5 driveshaft or 54.5? Iíve seen both mentioned.
Is there any cheap way to do this? I.e. junkyard equivalent? I have read that some people are using Crown Vic police driveshafts (conveniently 55.5 inches they say) and using a 1310 -1330 u-joint?
Donít have any driveshaft shops near me or I would go to one, also donít have $500 to blow on a fancy one.
Thanks in advance!
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post #2 of 17 (permalink) Old Apr 7th, 20, 8:33 AM
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Re: Driveshaft is 56.5 inches?

Quote:
Originally Posted by 68N8 View Post
I have a 68 Chevelle that had a Saginaw and 12 bolt in it. Just swapped in an Autogear M22 from 5speeds.com.
My current driveshaft from the Saginaw measures 56.5 inches center to center and I had to do everything I could to jam it in so I could drive home. The slip yoke is completely bottomed out and can only get it on the pinion yoke with mildly excessive force. .
My question is, do I need a 55.5 driveshaft or 54.5? Iíve seen both mentioned.
Is there any cheap way to do this? I.e. junkyard equivalent? I have read that some people are using Crown Vic police driveshafts (conveniently 55.5 inches they say) and using a 1310 -1330 u-joint?
Donít have any driveshaft shops near me or I would go to one, also donít have $500 to blow on a fancy one.
Thanks in advance!
That was the last thing you should have done. You were risking doing serious damage to your new transmission. Denny's Driveshaft and others show you the correct method for measuring.
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post #3 of 17 (permalink) Old Apr 7th, 20, 9:56 AM
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Re: Driveshaft is 56.5 inches?

If a 56.5 is all the way in a 55.5 would be just right.

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post #4 of 17 (permalink) Old Apr 7th, 20, 10:12 AM
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Re: Driveshaft is 56.5 inches?

Driveshaft is one of the last places to cut corners.
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post #5 of 17 (permalink) Old Apr 7th, 20, 12:21 PM
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Quote:
Originally Posted by 68N8 View Post
I have a 68 Chevelle that had a Saginaw and 12 bolt in it. Just swapped in an Autogear M22 from 5speeds.com.
My current driveshaft from the Saginaw measures 56.5 inches center to center and I had to do everything I could to jam it in so I could drive home. The slip yoke is completely bottomed out and can only get it on the pinion yoke with mildly excessive force. [IMG class=inlineimg]/forums/images/Chevelles_2016/smilies/tango_face_crying.png[/IMG].
My question is, do I need a 55.5 driveshaft or 54.5? I’ve seen both mentioned.
Is there any cheap way to do this? I.e. junkyard equivalent? I have read that some people are using Crown Vic police driveshafts (conveniently 55.5 inches they say) and using a 1310 -1330 u-joint?
Don’t have any driveshaft shops near me or I would go to one, also don’t have $500 to blow on a fancy one.
Thanks in advance!
Just got an aluminum one they have sizes for certain years mine was for 67 and it fit perfect $489 but they have steel one $349 mine came with 1350 pinion yoke side 1310 slip yoke side as I changed my rear and added Strange 1350 yoke but normally 1310 each end it eliminated my highway vibration http://www.alldrivelines.com/68-72chevelledriveshaft/
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post #6 of 17 (permalink) Old Apr 7th, 20, 2:52 PM Thread Starter
 
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Re: Driveshaft is 56.5 inches?

Understood. I was borrowing a lift and there was no way to leave the car on it, wasnít allowed to leave the car there, no other way home, could not afford a tow. you get it. Drove it 20 miles home parked it and took driveshaft back out.
Good news though, I found a local business that has a second location about 75 miles away that does driveshafts. They get it there for no extra charge and said taking 1 inch out and balancing will be $65! Just dropped it off. Expecting it back by the end of the week.
Would love to get one of those fancy driveshafts, but need to save money.
Thanks for all the help and advice.
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post #7 of 17 (permalink) Old Apr 7th, 20, 3:12 PM
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Re: Driveshaft is 56.5 inches?

I could have sworn my driveshaft with my AutoGear M22W and 12 bolt was 54.5" on my 71 Chevelle. Mind you it could have been a good half inch longer, but it had a very long slip yoke.

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post #8 of 17 (permalink) Old Apr 7th, 20, 4:59 PM
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Re: Driveshaft is 56.5 inches?

If you were on two post lift, and if this a 4 link type Chevelle rear suspension, the driveshaft is tightest with suspension hanging. It will move out of the trans 3/4" when car is on the ground.If all the "ifs" are true , then you didn't hurt anything driving home. Check it before you have it shortened, an inch may not be nesessary

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post #9 of 17 (permalink) Old Apr 7th, 20, 9:12 PM
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Quote:
Originally Posted by Bradco View Post
Quote:
Originally Posted by 68N8 View Post
I have a 68 Chevelle that had a Saginaw and 12 bolt in it. Just swapped in an Autogear M22 from 5speeds.com.
My current driveshaft from the Saginaw measures 56.5 inches center to center and I had to do everything I could to jam it in so I could drive home. The slip yoke is completely bottomed out and can only get it on the pinion yoke with mildly excessive force. [IMG class=inlineimg]/forums/images/Chevelles_2016/smilies/tango_face_crying.png[/IMG].
My question is, do I need a 55.5 driveshaft or 54.5? I’ve seen both mentioned.
Is there any cheap way to do this? I.e. junkyard equivalent? I have read that some people are using Crown Vic police driveshafts (conveniently 55.5 inches they say) and using a 1310 -1330 u-joint?
Don’t have any driveshaft shops near me or I would go to one, also don’t have $500 to blow on a fancy one.
Thanks in advance!
Just got an aluminum one they have sizes for certain years mine was for 67 and it fit perfect $489 but they have steel one $349 mine came with 1350 pinion yoke side 1310 slip yoke side as I changed my rear and added Strange 1350 yoke but normally 1310 each end it eliminated my highway vibration http://www.alldrivelines.com/68-72chevelledriveshaft/
X2 on alldrivelines. I originally did the crown Vic aluminum shaft and then I snapped rear ears off it! Then purchased a steel one from them. It was 329 shipped I believe. No problems over the last 2 years.
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post #10 of 17 (permalink) Old Apr 7th, 20, 9:26 PM
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Re: Driveshaft is 56.5 inches?

I posted some pics 2 days ago in another thread of a 68-72 DS it was 54.5" center of U joint cap to cap


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post #11 of 17 (permalink) Old Apr 8th, 20, 9:03 AM
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Quote:
Originally Posted by shovelrick View Post
I posted some pics 2 days ago in another thread of a 68-72 DS it was 54.5" center of U joint cap to cap
That is how I measured mine, emphasis on having the wheels on ground or jack stands under rear end while measuring my 67 was 62 5/8 and 9/16 on the shaft out of tranny 2004-r 27 spline
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post #12 of 17 (permalink) Old Apr 8th, 20, 9:19 AM
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Re: Driveshaft is 56.5 inches?

The pics I took the DS was on my pic-a-nic table, I'll see if I can find them, my laptop went date on all my pics so makes it a little screwy finding them
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post #13 of 17 (permalink) Old Apr 10th, 20, 8:29 AM Thread Starter
 
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Re: Driveshaft is 56.5 inches?

Update: yes could not get the driveshaft in even when the car was on the ground with full weight on suspension.
I found a local shop that does driveshafts at their other location so dropped it off and they brought it there at no charge to get the work done. Got it cut and balanced for $65 since I mentioned my friends name who gets a lot of work done there.
Took 1 inch out exactly center-to-center. Now at 55.5 inches.
Fits in perfectly Now but weird that I have 1.5 inches of yoke sticking out. Is that ok?
Iíve read 1 inch is optimal,
should I have taken 1/2 inch out making it 56? Feel like ďIím getting the shaftĒ here.
Just wondering if i have a 3.75 inch yoke, is that ok having 2.25 inches of spline contact in the transmission or should I start looking for a Longer yoke or fabricator to get a yoke to have 2.75 of spline contact?
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post #14 of 17 (permalink) Old Apr 10th, 20, 8:34 AM Thread Starter
 
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Sorry if dark, but here is a picture of what I’m looking at with car on ground. Yoke measures 1.5 inches out of transmission. This is a 3.75 yoke.
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post #15 of 17 (permalink) Old Apr 10th, 20, 9:56 AM
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Re: Driveshaft is 56.5 inches?

Some Chevrolet trucks had aluminum drive shafts with long yokes. I have used these long yokes on dirt track cars due to the greater suspension travel.
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