Can anyone tell me why Chrysler switched to the 6 bolt pumps on 3.5L's? Is it 97 only thing? Premature failure on some years? For example... I have a 94 LHS. When I bought it from the original owners, it had 67K on the odometer, (now 76K), and the pump was weeping a little when I bought it. When I swapped the WP/TB in it, I was expecting to see OEM parts still in it, considering the low miles. To my surprise, the WP/TB had already been changed once, but while I was there, I did it all.