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driveshaft angle
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10sec.et
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Location: Houston,Texas
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1969 Oldsmobile Cutlass

PostPosted: Mon Apr 30, 2007 11:22 pm    Post subject: driveshaft angle Reply with quote

i finally finished welding my housing (pics coming soon) and did a quick mock-up to see how it fit in the car. the driveshaft has the wrong angle when the diff is at the height i want it to be (see attatched sketch). i dont want the car to sit high like some weird 4X4 but i doubt the current angle of the driveshaft will work either. the best i can think of is to raise the trans and lower the diff housing to split the difference. any better ideas ? i assume the angle on the trans should be the same as the diff.

BTW the sketch is exaggerated for illustration purposes.



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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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nwcc
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PostPosted: Tue May 01, 2007 12:51 am    Post subject: Re: driveshaft angle Reply with quote

10sec.et wrote:
the best i can think of is to raise the trans and lower the diff housing to split the difference. any better ideas ? i assume the angle on the trans should be the same as the diff.

BTW the sketch is exaggerated for illustration purposes.


Are you using the stock style control arm rear suspension?
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue May 01, 2007 7:26 am    Post subject: Reply with quote

no, it was too much trouble to put the factory suspension back on so i went with ladder bars.
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beersngars
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1948 Chevrolet Coupe

PostPosted: Tue May 01, 2007 8:18 am    Post subject: Reply with quote

Are the ladder bars not adjustable??
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue May 01, 2007 8:26 am    Post subject: Reply with quote

yeah, they are adjustable. i havent mounted the ladder bar crossmember yet either. im just loking for suggestions for the best way to go about setting all of this up.

if the trans yoke is lower than the diff yoke, wouldnt that be backwards on the angles ? or does it matter ?

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beersngars
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1948 Chevrolet Coupe

PostPosted: Tue May 01, 2007 8:43 am    Post subject: Reply with quote

I would think the diff would have to be lower but not sure. I do know you want the ladder bar parallel to the ground at ride height. That should give you an idea where the cross member goes. Can the trans go up?
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue May 01, 2007 9:26 am    Post subject: Reply with quote

the trans can go up about an inch. i may just have to live with the fact that the car will need to sit higher in the rear Sad .
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nwcc
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PostPosted: Tue May 01, 2007 10:35 am    Post subject: Reply with quote

10sec.et wrote:


if the trans yoke is lower than the diff yoke, wouldnt that be backwards on the angles ? or does it matter ?


Whats the angle of the axle yoke?

Most ladder bar instructions that I have read say to set the axle yoke -2 to -3 degree's at installed height. Are you outside of that spec? What did the instructions with your ladder bars direct you to do?
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue May 01, 2007 11:03 am    Post subject: Reply with quote

i dont have a problem getting the diff yoke to that spec, the problem is my ride height causing the angles you see in the diagram. i wanted the car to sit level but with 30 inch tall tires its a bit of a challenge getting the driveline correct. seeems to me that the trans and diff should have opposite angles.
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nwcc
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PostPosted: Tue May 01, 2007 11:36 am    Post subject: Reply with quote

After reading your post I went out an checked the angle of my transmission tailshaft. Its -2 so I'm in a similar situation as you. I'd bet that most cars are this way.
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af2
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1933 Willys Coupe

PostPosted: Tue May 01, 2007 1:34 pm    Post subject: Reply with quote

10, if the trans is pointing down you want the axle pointing up to make a straight plain and allow the U-joints to work together instead of against each other.

Hope you understand what I am trying to say.
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nwcc
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PostPosted: Tue May 01, 2007 1:48 pm    Post subject: Reply with quote

Welcome back AF2

Did you get some R&R?
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue May 01, 2007 2:21 pm    Post subject: Reply with quote

good to see you back. how was the vacation? at least thats where i assume you went.

oh, back on topic, i found this article....http://www.carcraft.com/howto/91758/. af2, i understood what youre saying and its the "straight line" part that makes me believe i need to get the diff a bit lower because the way it is now, if i raise the pinion angle opposite of the trans, theres no way possible it could make a straight line through the drivetrain with the pinion pointing up.

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af2
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1933 Willys Coupe

PostPosted: Tue May 01, 2007 2:29 pm    Post subject: Reply with quote

10sec.et wrote:
good to see you back. how was the vacation? at least thats where i assume you went.

oh, back on topic, i found this article....http://www.carcraft.com/howto/91758/. af2, i understood what youre saying and its the "straight line" part that makes me believe i need to get the diff a bit lower because the way it is now, if i raise the pinion angle opposite of the trans, theres no way possible it could make a straight line through the drivetrain with the pinion pointing up.



That bottom picture on that page is what I was saying.

Vacation was great! All of us stayed out of the Mexican jail and caught some big Dorado and Marlin. Nothing like the Caribbean in April!
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beersngars
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1948 Chevrolet Coupe

PostPosted: Tue May 01, 2007 2:33 pm    Post subject: Reply with quote

If you scroll down about half way thru the CarCraft article, there is a diagram that makes it easy to see what Adam is talking about. Below it states "Ideally, the angles between the transmission output shaft and driveshaft, and between the driveshaft and the pinion will be equal and opposite." Thats the the old rule of thumb formula. Most of the time the trans angle is somewhat fixed and the pinion angle is the "experimental" angle. You'll know if it's wrong the first time out. Shocked
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