transmission tail housing swap?

[jds4racing]

i am looking to convert my 2wd truck to a 4x4 and was curious if i could swap the tail housing on it, and just get a 4x4 tail housing and bolt the t case to the back of it. The transmission is a m50 d1. Is the spline count different on the 2wd m50 and the 4wd model?
any help is greatly appreciated

 

[Snoranger]

Its been covered many times here. You need to tear down the trans and change the output shaft also.