Make sure you buy the lockers that are specific to the differential gearing.
Eaton 19969010 Eaton Elocker 4, Dana 44, 3.92 & Up, 30 Spline
https://Amazon.to/3iXKtz6
Eaton 19977010 Eaton Elocker 4, Dana 44, 3.73 & Down, 30 Spline
https://amzn.to/3x8XVFH
Eaton 913A589 Detroit Truetrac Rear 30 Spline Differential for Dana 44
https://amzn.to/379Aq4H
#westcoastdifferential
https://www.differentials.com/