Sun gear 4l80e
 

Are these grooves normal? I have 2 4l80e's and both sun gears look the same. These grooves strikes me as . If you look at the pic, the grooves don't look like they were originally machined there due to the roughness. If this groove isn't normal, can the sun gear be replaced by itself or do the Direct clutch housing (623) reaction carrier assembly (651) planetaries also have to be replaced?

Cheeers

Help me out here are we talking about the two ID groves or the wear in the rear part of the gear or just the finish of the gear itself?

I believe he is talking about the 2 I.D. groves in the center of each section.

I believe it is ok for the 2005 model he has even though it's not shown on page 109 in the ATSG manual.

The first one is from a 1995 I took apart. He is afraid it should look like that

The Second image came from a 2005 assembly with the blue fabric, I stole from ebay.

here is the best pic i have of mine. Mine is a 2001 with about 100k on it.

http://i27.photobucket.com/albums/c1...d/4L80-069.jpg

http://i27.photobucket.com/albums/c1...d/4L80-079.jpg

yes I was talking aboutthe 2 I.D. grooves and except from the first pic from 1FastBrick they all seem to match mine.
Thanks guys!

The first picture is from the old style 97 and below. :cheers:

Dont forget to install that sun gear chamfered side down. I am pretty sure it goes down. Your manual should say.

Good tip! :cheers:

Also while your there order a new washer. Mine was worn plus the newer one is wider. the washer is less than $2

http://i27.photobucket.com/albums/c1...d/4L80-095.jpg