Ive been having trouble with trans not shifting out of 2 until high rpms , after vech hot. I put cap on dump pipes and today drove it after adjusting t cable and it shifted hard no matter how I adjusted it.I noticed that when I gave gas I heard a small swish on back of engine so then I put it in over drive it done it nostop put in 3 and it didn't do it.I turned car off in park and I heard it at end ever time.Anyone had this problem??almost sucking noise almost sound like tourque converter not sure.