904 no 3rd gear?Why?

Here,s a little history on the 904 I bought.I purchased a 360 rebuilt from a guy and he through the tranny in with the deal,so I took the tranny to a respectible tranny shop( I,ve known the owner and his co0worker for 30 years)asked them to check out the 904,they went over it and said it was o.k so I asked them to install a Trans-go 2 kit and get me a 2500 stall.I got the tranny back from them and installed it.During my test runs to set the lokar kickdown is when I noticed no 3rd?Other than that it worked great.I,m hoping this is just a small mistake and easy fix.When I talked to him this morn. he was measuring the ball,it was .343 thou.Which is the right size?Correct?I,ll know more in the morning when I go over there!Later.

.343=11/32" so that should be right. Tell him to check the 2-3 shift valve. May just have a piece of crud in it keeping it from working.