Hopefully somebody may have the information I need. I believe my transmission may be taking a dump on me. Last night I stopped going in forward and shifted in to reverse to back up to a driveway, and I got about 10' in reverse, and then I heard a god awful grinding and spinning noise, and I stopped moving. I shifted back into forward and slowly took off and it seemed ok. When I got home I tried reverse and forward shifting again, and I drove it to work today with no problems, but i'm afraid it could go without warning, and I want to check around on pricing for either rebuilding it or buying another rebuilt one already. I have almost 117,000 on the truck, and the fluid is full and I believe the original, and may smell a little burnt but still red. Can someone tell me for sure how to tell if I have the 4L60E or the 4L70E? The pan looks pretty square so I take that to mean it's not the 4L80 series? It's a 2008 1500 CC 4x4 LTZ. J is the 8th VIN letter. Thanks for any information.