Hey guys, we have Driveshaft Specialist on board as a sponsor!
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I wanted to add, I have personal experience with this company. We've bought more than a dozen drive shafts from them and every one of them have been perfect!
They can build anything from stock to extreme HP! Diameters are up to 5", call to find out which drive shaft is suited for your driving style.
I use their 4" steel shaft in my truck and it hasn't had one issue.
Located in San Antonio, TX
http://www.driveshaftspecialist.com/