I am not sure if napa sells them, i bought some but cant remember where i got it from. If you do it you have to get your drive shafts modified to accept the bigger u-joints. So try a local driveshaft shop.
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06 ctd,lb,qc,dually,48re,red,all isspro guages,mrbp exhaust.
95 ctd,lb,sc,5 sp,5" stack,8" lift,38" tires, gonna throw some hp this things way.