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My engine was built Aug 98 I forget what the door sticker was but it's a E99. Now one of the easiest ways I have found to see if you have a E99 engine is a E99 has a 4 bolt compressor housing and a late99 has a 5 bolt compressor housing.
Now as some have pointed out there was a period that you could have a truck with a late99 engine and still end up with E99 brakes?
My engine was built Aug 98 I forget what the door sticker was but it's a E99. Now one of the easiest ways I have found to see if you have a E99 engine is a E99 has a 4 bolt compressor housing and a late99 has a 5 bolt compressor housing.
Now as some have pointed out there was a period that you could have a truck with a late99 engine and still end up with E99 brakes?
Would not surprise me at all. I have found there are some front end suspension parts that have a switch over date of March 1, 1999. The Pittman arm might be one of them. I don't feel as though that slightly larger rotor will make a big difference with the brakes. It would help dissipate heat in heavy use applications but if you're not in that category I wouldn't worry about it. And I am not. The pads have the same surface area.