Rear Axle yoke swap?

I've got an 8 3/4" rear axle with 489 case. I'm getting ready to buy a driveshaft. My trans slip yoke has 1350 u-joints but the rear axle has 7260 u-joints. The driveshaft shop suggested swapping out the yoke on the 3rd member so that I have all 1350 u-joints.

I was under the assumption that changing this would require a new crush sleeve or a rebuild.

What's required to change the yoke on the 3rd member?

Riddler