Yes, my 4l30E came out of a Trooper. If you are going to spend the money, you should get the 4l60E, direct bolt in, and a much stronger tranny. Wish the insurance company would have okayed that for me, they said they wouldn't pay a dime if I did, even if I offered to pay the difference. Now that company went tits up, and I am waiting on the court date for the lawsuit. BOOOOOOOO!!!
If you aren't getting slippage, I would do nothing, what is the worst that could happen, you have to get the tranny rebuilt? I paid 900ish for mine, shipped, with a 3 year warranty.