I have pan off and valve body dropped, trans is in the car. I would like to air check the clutches before assembling again. Can anyone show me where I am to apply the air on the upper valve body of the trans to test? Thanks, Jon
http://www.nastyz28.com/forum/showthread.php?t=53671 Check out this thread by Jake. He is a great guy with lot of knowledge.
Thanks, that is a great article but it doesn't show how to test the clutches in the car. I am trying to diagnose before I pull it. Just did a rebuild and have no 2nd gear even when manually selected. Thanks, Jon
You check the low rev piston at the rear of trans case . Looking up you will see three holes. . The one with the screen in it or the one next to it . Don't worry about blowing the wrong hole , you will no when u got the rite one, should hold pressure then release when u let go of the air. You will get some action up at the pump too. And also u can apply the band, look for holes near the servo. You have to have a manual though you pulled the valve body. 25 inch pounds on the bolts , or snug and a nudge. Wait I bet u left the plate and the check balls up there. That's a much tougher aircheck. Easier to pull the plate. , I would make sure your modulator valve is not stuck in case and make sure ur govner not stick either. Hold it by the gear , gear up and move each weight in and out, the valve in the middle should move up and down with it.
Thank you for the replies. I finally did figure it out. I took a piece of paper and a crayon and made a imprint of the passages on the case. On that sketch you will see 3 red dots. Those areas are the spots that need pressurized to test the clutches other that the low/reverse which was described above. I then made the plate to mount to the case and drilled small holes where I applied air. Turns out my 1-2 clutch was not pressurizing so I pulled it, did a seal replace and all shifts fine now. Hope this helps someone else in the future. Thanks, Jon
Nice work! I would have to stamp that plate "TH350 AIR TEST", so I didn't forget and toss it some time down the road. Bruce Roe
I guess you can say you learned yourself somethin, but I have never seen it done like that, all it takes is a blow gun like a vacula, stick in hole in case and pull trigger, an air check on the drum before assembly would also save some time . Your way still beats paying somebody though!
http://turbobullet.com/forum/viewtopic.php?f=27&t=9181 I knew I had seen it somewhere. Even has a pic to help with hole identification. Kinda late but may help someone else. Good you got yours figured out.
