The pump on my 93 4WD E4OD is starting to whine slightly, so I picked up a rebuilt F5 unit to replace it with. I have a few questions about the alignment of the "new" unit though before I install it. The outside diameter of both pump halves are perfectly aligned with each other, but the 11 bolt holes are slightly off. I read somewhere that you might not ever get the holes perfect, and that aligning the outside perimeter of the two halves was the most important factor. Hopefully the pictures will determine whether or not I need to disassemble and reassemble the thing before putting it into the transmission. I aslo read somewhere that one of the bolt holes as an alignment one and that once you put the bolt through it and into the transmission case the holes will align themselves the rest of the way?



Here you can see the outer edge of both pump halves are aligned



You can see here that this bolt hole isn't completely aligned



Another view of a bolt hole that is slightly off



Both of the brass bushings at the top and bottom of the stator have this spiral "groove" in them are they supposed to?



Top view of the entire pump assembly. Even though the 11 bolts are not installed, the thing doesn't seem to want to come apart.



Bottom view of the entire pump assembly

 

I would say that it is true that the bolt holes dont seem to ever all line up perfectly, if all the bolts will go through the holes you should not have any issues with the pump. The alignment of the two halfs are critical, you can test fit the pump into the case without the o ring to see if they are aligned with each other. If the pump does not just drop in then you will have to align the half's again. Once they are aligned install the pump with the o ring, you should be able to push the pump down with your hands, do not use the bolts to pull the pump down. If you must align the pump loosen all the 10mm black bolts on the backside, remove the o ring and use a band or something around the pump to bring the two half's into alignment. I have used a old timing belt flipped inside out to do this.

The bushing with the groove is as it should be.

I would see if the pump has any upgrades to it before installing it, it would be beneficial if it has a updated boost sleeve and <acronym title="Page Ranking"><acronym title="Page Ranking">PR</acronym></acronym> spring along with a updated converter regulator spring, this will help with converter shudder and the overall performance of the trans. You can find these items in a Trans-go shift kit.

Do not pry the old pump out of the case from where the filter is connected it will result in a broken case, it must be removed from the front.

Just so you know these pumps rarely have issues, if they make noise its usually due to a restricted filter (which means bigger problems) or the noise is coming from the converter instead of the pump.