I'm swaping an 06 silverado 5.3 into a full size jeep and I would like to know the difference between the stock 4x4 vs 2x4 Y pipe and cats are. I have a passenger drop transfer case (NP 421c).

Just trying to get ruff fitment challenges thought through.

Thanks

 

Only difference ive seen was where the Y pipe comes together. The driverside pipe is a steeper angle to clear the crossmember than the 2wd. Besides that i think they are the same.
Some year models the cats were at a different location. Just cant rem which was which.
I wanna say the 99-02 had the cats parllel to the ground? And the 03+ the cats were closer to the manifolds at an angle.

 

Thanks...thats a big help....I am probably going to have to modifiy the pasenger side of the stock Y to clear my cross member and passenger side front drive shaft...I think I want the later model system with the cats close to the exhaust manifold.