Guys, I have a 96 Tahoe (also 73 Blazer) and I am having a tranny problem. At this point I hear a whining noise that is timed to engine RPM. It is more pronounced while in gear. Almost sounds like a noise you would hear in an AM radio from ignition noise but I know it is not that. The sound seems to be coming from the tranny and I think it may be a pump or something like that. The truck has 96K on it with about 20K of those towing a 5600lb boat on the highway. I have serviced the tranny every 10 to 15K. Will a 4L60e whine when it is going bad? GM rated the towing capacity on this Tahoe at about 5 or 6K. I am considering getting a 4L80e from the junkyard and having it rebuilt. Is this a straight swap over or am I getting into a project with no end in sight? Is there any kit than actually beef up the 4L60e to handle the weight I am towing? I plan on someday needing to tow 9000 lbs. When that day came I thought about pulling the engine and putting in a 400 small block and a 400 tranny. What may be involved in doing this conversion? I know I would lose the OD and have some computer bypassing to do but has anyone done this? Any thoughts? Tim T.