From 04-06 the 3.5 was a modified 3.4L, then they switched to a new block for the 3.5 and 3.9 in 06-08 Classic
From 04-06 the 3.5 was a modified 3.4L, then they switched to a new block for the 3.5 and 3.9 in 06-08 ClassicI thought they shared the same block. Huh, learn something new every day. I guess that explains why you haven't heard of any 3.5's w/lower intake manifold gasket problems.