Shortening a drive shaft

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When building a car from mixed pieces or after doing and engine-trans swap you usually need a new drive shaft. Drive line vendors have info posted on how to measure the length you need. Usually install the trans yoke all the way in then pull it out 1/2 inch then measure between U joints.  
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When building a car from mixed pieces or after doing and engine-trans swap you usually need a new drive shaft. Drive line vendors have info posted on how to measure the length you need. Usually install the trans yoke all the way in then pull it out 1/2 inch then measure between U joints. Anon edit: I did this professionally for a year, the correct amount is 1". Then measure the distance between the joint centers.  
  
 
For the The next step I get out the dial calipers , measure the U joints required then head to the parts pile or the the local wrecking yard and start measuring,  There are conversion U joints that have opposite sides  different sizes,  I check out the rack and also don't forget to check out light and medium trucks. I have found 1/2 of a 2 piece truck drive shaft that fit one of my project. If you don't find one to fit then look for a longer one with minimum balance weights. If the factory got it close enough with out weights you will have better luck getting it balanced.  
 
For the The next step I get out the dial calipers , measure the U joints required then head to the parts pile or the the local wrecking yard and start measuring,  There are conversion U joints that have opposite sides  different sizes,  I check out the rack and also don't forget to check out light and medium trucks. I have found 1/2 of a 2 piece truck drive shaft that fit one of my project. If you don't find one to fit then look for a longer one with minimum balance weights. If the factory got it close enough with out weights you will have better luck getting it balanced.  

Revision as of 18:59, 22 December 2011

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