i have to replace my t-case because it will no longer shift into 4L. i am going to get one from the jy. i have a np231 in right now. should i go with the the same kind or is there one that is a step above this?

since im going to have my case all the way out, i want to do a hack and tap on it. If someone has done this id like to know what kit they used and if they've had any problems with it. or any tips while im doing this.
any help would be appreciated

 

i used iron rock off road the drilling and tapping was a ***** even with there bits i would put the shaft in since its gonna be out and use a front shaft in the rear it works

 

Honestly its probably easier to do the hack n tap with the t-case on the jeep, thats the way i did it. heres a link to some good instructions.
http://go.jeep-xj.info/HowtoSYEconversion.htm