Hello, new to forum and ford automatics. Just purchased a mustang with C4 trans. With the shifter in drive it shifts great other than the early up shifts. Try to shift manually and the problem begins. When I go to 2nd it feels like nuetral. Engine revs to about 4000rpm then its like popping a clutch in 5 speed. Let the rpm fall below 4000 and its like nuetral again. Upshift to 3 and its normal again. Under WOT manual shifting works great and definately not sluggish.Thanks for the help in advance.