Sunday, May 21, 2006



How about a little driveshaft technology? Since we put a 2" suspension lift on this thing and with the longer pinion nose of the Dana 44 the already short drive shaft exceeded the 10 deg. max angle per a single u-joint. Plus looking down at the driveshaft it did not line up with the differential by 1 1/2". So now we have a compound angle to deal with. Everything I have read states that if the pinion angle is parallel with the output shaft and it doesn't exceeds 10 deg. a single u-joint can be used at each end. What a lot of people do if the angle does exceed 10 degs. is they tilt the pinion up so that it is parallel with the driveshaft. That's ok if you run a double carden joint on one end and a single on the pinion end. You see it takes 2 u-joints at the same angle to cancel out any vibration, as they turn they do not run at a steady speed, they run fast & slow. Therefore a second joint on the same end is needed to cancel out any vibration. When the driveshaft is parallel to the axle it will not set up a vibration. In our case we could have gotten away with tilting the pinion up if the pinion would have been in a straight line to the driveshaft looking down on it, but it was 1 1/2" off center. (compound angle) So we needed a double carden on each end to cancel out 2 different alignment issues. Several shops told me it would only vibrate slightly at different times and that a double carden was not needed. Well this thing is going to be street driven, and if it can be built with no vibration, then it will be built with no vibration. I knew of Tom Woods http://www.4xshaft.com/index.html but figured a local shop would be cheaper. The same shop that shortened the axles also did driveshafts. So I told Hartman Driveshaft and Axle, of Reading Pa. what I wanted. At first he claimed that we didn't need a double carden on each end that the vibration would be minimal. I persisted, even gave him some carden yokes to reuse and gave me a verbal quote of $500 to $600. Till it was all said and done the total was $944.73. OUCH!!! Now don't get me wrong, this shop does super quality work, did a great job on the axles, and takes pride in their workmanship. The killer driveshaft will never brake and the quality is impeccable, I'm just saying, shop around. I could have had the same shaft built by Woods and delivered to my door with a warranty for $650.00. Oh well, at least the front drive shaft is stock and only will require a rebuild.

2 Comments:

Anonymous Anonymous said...

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6:51 AM  
Anonymous Anonymous said...

Nice idea with this site its better than most of the rubbish I come across.
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8:26 PM  

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