760X should be the correct joint. It's the replacement for the original 297X joint that the Jeep came with. Boxed wrong maybe?
Also, there is NO seal where the inner axle enters the tube.
1975 Chevy K20 8400lb GVW Camper Special
1971 Gladiator J2000 Platform-Stake Dump 350/T18
1970 Gladiator J3000 3407Z Camper Truck 350/T18
1963 Gladiator J300 Townside 350/TH400