I HAVE A 700R4 TRANSMISSION OUT OF A 1986 2.8 LITER CAMARO ALL STOCK
I WAS DRIVING AND IT WONT SHIFT INTO 3RD OR 4TH GEAR i have 1ST 2ND And Reverse it went out on the interstate i got my friend which is a mechanic to look at it we pulled it apart the gears etc all the gears are new in perfect condition any ideas please anything will help

 

Servo or TV cable could be your problem. Both are cheap and easy fixes vs rebuilding the hole transmission. If its holding in first and 2nd and shifting smooth then you may be in luck and it could be a easy 20-50 dollar fix.