Today I pulled the driveshaft, it was apparent immediately I had the correct u-joint( Precision 369) for replacement.
I brought the driveshaft and u-joint to a heavy duty mechanic shop, they installed the new u-joint, I used a Precision 369 on the front, and a Precision super heavy duty #280 on the rear, they are the same u-joint , one is super heavy duty, and has the grease nipple on the end of the cap.
The rear Spicer u-joint had serious wear, and some broken needle bearings, the front u-joint was not too bad, but replaced anywway. The Spicer replacement is a #1320 series Spicer U-joint.
I saved a lot of cash by not buying a set of NOS U-joints from an NOS supplier, this is a common joint, and is for 46-48 Canadian Mopar 6 cyl Cars.
I will post some pics later..........Fred
Total Price, $60.00 Cdn for the U-joints, and $75 Cdn labor (1 hour) for shop to install on the driveshaft, I did the R&R on the car, remember this si Canada, prices are higher here