I have a 49 ford w/351-w engine & a.o.d. trany. rear end is 77-8" maverick. Am getting vibration at speeds past45m.p.h. Myengine is 5degrees down ,axle is2-degrees up ,shaft is pointing toward trany shaft. should I have custom made shaft w/ double cardan c-v joint or does any ford product, like lincoln town car already have this?my existing shaft was built w/std. u-joint ,but while doing checks on this vib. problem yesterday, I used a dial indicator on shaft & found it was out by .090" ! Is this deflection caused by bad angle or by bent tube. I haven't abused or raced car . Strictly show& cruise.