The other day I went through an entire ordeal trying to salvage the transmission in my 1989 S10 Blazer 4x4. This is a factory 700R4 with no modifications. In the process, I searched for over a day trying to find help on check ball locations, and unfortunately, not one piece of info found on the net helped me out. Some mechanic sites had the check ***** postioned over bolt holes, some sites showed ball locations, but some ***** omitted for shift kits. So I figured I would post pics of all of the proper locations for a factory 700R4 transmission (4 speed overdrive w/aux valve body) Tips for location, look closely at the separator plate for ball wear. Holes with wear. Hope this helps someone in the same circumstance down the road. So far, my transmission is working just fine. Hope it stays that way. I used Vaseline to keep the ***** in place in the valve body, and on the separator plate as I installed, because the tranny was still in the truck. Total, there are nine check *****. 8 of them 1/4", and one 5/16". One of the 1/4" check ***** are in the case side of the tranny itself held in place in a capsule, which is located beneath the auxilary valve body. Some people elect to remove it. I did not.



Location of 1/4" check ball inside of Aux Valve Body:



Case side of separator plate with 1/4" check ***** (4 of them) in proper locations:



Then the valve body itself with two 1/4" check *****, and one 5/16" check ball:



Hope this helps someone who has to face an aggravating situation, and save them some trouble.