1991 700r4 Wont Shift
 

I bought a 1991 Chevy Camaro Z28 L98 TPI off craigslist for 500 the guy said the tranny was bad so i towed it home and the tranny had next to no fluid in it after adding around 5 quarts of fluid to the tranny it went into gear perfectly. I adjusted the tv cable like every one says to then I went to drive it down the street to see how bad the tranny was and it would not shift from 2nd to 3rd with it in over drive or drive it was stuck in third. So the tranny works in P, N, 1, 2, but theres not 3 or over drive. I have a second tranny for it just curious if theres something that i could check before doing the swap?