adding a positrac to a non posi rear

[AmadeusCharger500]

I have a 742 case with 3.23 gears sittingin my garage and what I believe is a detroit locker. Can the one be added to the other? I know I need a clutch kit to do a rebuild but should I replace the gears also?

[femtnmax]

I thought only Ford used the lockers, and they used spring loaded gears to "lock" the axles together (no clutch packs), the gears "rachet" around corners.
For the 742 case, you would need a sure-grip ring gear housing, the clutch kit goes inside the housing.  Could use your old ring and pinion gears, but would need to reset the gear mesh because replacing the ring gear housing means the original gear mesh is history.
I rebuilt my 742 case,and added sure-grip as you are considering.  Took me some time as I did not have the factory checking tools, so alot of removing the large pinion bearing, changing bearing shims, then reassemble and check teeth contact pattern.  Would have been easier to have it built by a shop that has the proper tools IMO.

[firefighter3931]

Sure....lockers are available for 8 3/4 centersections.


Ron

[speedfreak68]

don't mean to hijack your thread, but is anything available for the 741 case?