Driving in to work today I noticed when coasting in 4th or 3rd at say 1300rpm, every 5 seconds the revs would drop to about 1100rpm, every 5 seconds. Also seems like when I'm accelerating and it changes from 2nd to 3rd, it would rev high really quickly just before shifting. Not a lot, but if it was about to change at say 2500rpm it would quickly rev to 2800rpm then change, so you really notice it when it's normally smooth and unnoticeable. Is my tranny on the way out?