Call 686 4614. He can scan the TCM and identify if it's a valve body issue. I remember Gobin having one of the SI drives trans..I think it was '06 though..you can still check..N.B all the numbers on the replacement trans MUST match up tho..b wary of that b4 u purchase.
If it is a problem with the valve body you don't need to replace the entire transmission. You can get a new valve body for less than an entire new transmission. You can pm me or call 784-1808 for more info.