I'd say that you'll be better off (and probably less expensive) to have a locker installed in your differential... In yours you know how it's been treated, as opposed to the rear on a different truck where you have no idea how it was maintained or abused, so that's what I'm basing my recommendation on...

My $0.02 at least...

Tim
"The_Sandman_454"
[img]/wwwthreads_images/icons/cool.gif[/img] '79 Suburban 4x4 454, 6" lift, 35x12.5s & '85 GMC S15 4x4