I picked up a driveshaft out of a 67 or 68 cougar today. It looks the same as the one in my 68 mustang. Im going to have it shortened to fit my 65 with a T5 and 9". The back of the driveshaft is different than the driveshaft that came in my 65. Instead of both yokes being welded on, the back one that bolts to the rear is attached in a different way. I cant tell how, but it goes into the driveshaft and is surrounded by rubber. i assume this if for dampening purposes, but is this a prob in higher horse applications, say around 350 or so? also, what brand u joints do you recommend for this type of application? and anyone know a good place on the peninsula in the sf bay area that can do the cut and balance and u joint install for a good price?