Im having to run two 1350 to 3r conversion joints with my new drive shaft I can only buy the conversion joints in the greasable type. I know the grease type u-joints are suppose to be weaker then solid u-joints has anyone broke any of these running them in there cars? My car is around 400rwhp and is a m6 with drag radials will they hold up well?

 

Find a 3R to 1330 solid joint.

Replace the caps on the 1330 sides with caps from a 1330-SPEC joint (same i.d. to the joint but use the 1350 o.d.)

 

Are you talking about the ford 1330 special joint? If you are its o.d size is 1-1/8th and 1350 is 1-3/16th so i dont think they will work.