ok I installed this 2004r tranny in my 66 skylark , the trany was shifting fine for about 50 miles and today it is acting up, 1-2 shifts are fine but when it shifts from 2-3 it happens whay too soon and 4th comes in right after and lugs the engine I checked my cable and its correct, one funny thing once in a while it seams to shift correctly when I put the car in third gear it will do the same thing any ideas? I even turned off my lock up-controller and same thing???: