I have to replace my pitman arm on my 2005 h2. Does anyone know if it is a 3 spline or 4 spline, or is there anyway for me to know without having to take off the part?

 

 

So it’s a 4 spline?

 

I can't see your gear box nor your RPO codes?
Option N2 is 3 groove:

 

Go to the GMPartsGiant web site HummerZ posted prior and enter your VIN, It will provide you with the correct pitman arm part and tell you if its a 3 or 4 spline part.

I don't know what specific "N2" code that is mentioned as all of the RPO codes are 3 letters. I will say this, I have replaced the pitman arm on an 05,06 H2 and have purchased a spare for my 08 and all were 3 spline arms. For what its worth the only place I have ever seen the 4 spline part was on a 3500 series GM truck.

If you want the 3 spline HD version of the Moog part order: MOOG-K6654HD, these are the one's I have always used and are every bit as good if not better then the original factory GM part, and work great.