Detroit locker recommendations?

[Harper]

I have an 89 with the 5.8 engine. Can anyone recommend which locking differential would work for this rig? Thanks.

 

[Hoever]

I just put trac-locks front and rear in my 95 they are not quit as positive as a Detroit, they allow some slip to go around corners but they will lock up in the mud sand Were a detroit is locked any time power is applied to it