The rear sammy carrier is a 4 pin carrier with 26 spline sidegears,the front sammy carrier is mostly a 2 pin carrier with 22 spline sidegears.
The following parts will be needed for upgrading the front 3rd aluminiun to steel and installing,and if you wanna install a lockright locker a rear sammy carrier is needed.
1.1999 2.5 v6 front 3rd member
2.1999 2.5v6 front housing (optional)
If you not going to install a locker then you can just swop all your parts from your old housing to the new.If you wanna install a lockright locker then you will need a sammy carrier .The following is then needed..
1. Machined rear sammy carrier,with lockright 1510 locker and 26 spline sidegears.The 26 spline axles are stronger than the 22,and worthwhile upgrading.
2. A diff can to hold your pins from falling out
3. 26 spline axles from a 95 tracker or upwards.
Im busy with this install at the moment,just wating for my 26 spline axles and a diff can. I will take pics of all the parts and post it soon..