Merwin, My opinion is that the much-maligned ball and trunnion is a viable joint when in good condition. Once they are worn or broken, you have to make the decision to swap or repair. At the risk of repeating myself, the B&T was used by high-end auto manufacturers (Rolls, Bentley, etc) back in the 60's, and the same style joint was used in helicopters of the day as well. It's a very robust joint. Repair parts, while not cheap, are available. Once again, my $.02 only - if you have a street car/cruiser/Saturday Night Special that you romp on once in a while, the B&T is probably fine, if it's not clunking, clattering, or exposed to the elements (missing/torn boot). If you have a sticky tired boulevard brawler or drag car that spends a lot of time on just the rear wheels, you might want to move toward the more conventional cross type u-joint when the B&T begins showing signs of wear. The '64 "Color Me Gone" car at the Chrysler Museum was cloned from the old "Suspect 426" car that spent it's life in mid-Michigan. The car was a race car from day one. I had the opportunity to drive the car in the 80's - it ran low 11's at over 125mph, with the OE driveshaft. The car was kinda weird to drive - it had full upholstery and I always equated it with racing my mom's car. It was relatively quiet and smooth as silk, unlike my '63 that vibrated like crazy in high gear (needed a transmission mount, but that's another story). It was raced that way up until it became the "Color Me Gone" car in the late 90's, and I'm guessing if you crawled under it today, the same shaft is still there. You would need a slip-spline transmission (or tailshaft and housing if you're rebuilding) to make the swap. If the car were mine, I'd hold onto the slip spline stuff until you need it. SC -----Original Message----- From: Merwin Wrisley [mailto:vulcan@xxxxxxxxxxxxx] Sent: Friday, December 18, 2009 8:06 PM To: 1962to1965mopars@xxxxxxxxxx Subject: Re: disc brakes - caution, another long read with part numbers and prices No offense taken, never turn down a chance to learn something new!! While I've got your ear, my 65 Coronet 4-speed has the trunnion/ball driveshaft. I also have a 'shaft from a '65 727 car with the slip joint yoke. Will they interchange,and which is stronger? Thanks for all your imput, Warren ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.