2004 wedge or o'ring seal
 

Hey guys, I have a question regarding the 4l60E Pump to case seal. Was 2004 the year they changed to all wedge style seals or was that still a mixed badge of O'ring style mixed with wedge style. I'm asking because I'm trying to buy a replacement pump for a 2004 4l60E but the guy is telling me 2004 was a mixed badge. I'm sure it's a 300mm shaft but not sure if its a wedge style without taking it apart.

You can see the wedge style seal around the perimeter of the pump body. If it's an o-ring you won't be able to see anything between the pump and the case. I can't find a picture right now but you can definitely tell the difference, of course you'll need to have the trans out of the vehicle and the converter removed. HTH

Looks like I will have to get it out to double check before ordering a pump. I was trying to have minimal down time but it was too good to be true. Thanks for the insight :cheers:

It seems that many changes/improvements start with performance models and then filter to other models by the next year. I also think 2004 was a transition year for pump seals, so you really need to check what you have.

Most 2004 model years have the O-ring. If it's out of a GMT800 platform....I'd put money on it!

Thank you all for the input, I will take pics and post on what I have once I take it apart here in about two weeks or so.