So, I noticed on the W-Bodies, the radiator side of the upper motor mount has two different styles.

- First Style is a 4 bolt configuration to hold to the upper radiator brace.
- Second style uses a 5 bolt configuration to hold to the upper radiator brace.

From what I see, the 3800 drive trains use the 4 bolt style. The 3100/3400 uses the 5 bolt style. Pics of both below (one is my Monte and the other is a pic I scavenged with Google images, if it belongs to someone, thanks for posting a pic I could use to easily demonstrate my question).

OK, guys, speculate

 

Interesting, ive never noticed they had 2 different mounts

 

I wonder is the 3100/3400 has more "rock" in the W-Bodies and needs some extra support to lock them in.... Just curious what the masses think about this observation.

 

I think I got my answer. Someone on the Grand Prix forum pointed out an error in my information! The 3100/3400 uses a THREE bolt mount above the radiator. I just got a inperson visual inspection. Based on this new discovery, I would assume the 3800 4 bolt mount is a superior configuration, as it is braced for less ability to flex.

 

Hmm well interesting, now we know lol