Seeking 3.55 Ring & Pinion for an 8 1/4" rear end.

halifaxhops said
Works well, only issue is if you ever change the ring and pinion jeep uses 10 bolt ring gear and mopar 12

The Mopar and Jeep 8¼" use the same basic gears. Both have 10-bolt ring gears, but some of the newer stuff uses metric bolts as opposed to the old 3/8". Richmond and Motive dual-drill some of their ring gears for both bolt sizes.

The 8¾" axle uses a 12-bolt ring gear.