recently purchased a 91 Suburban 2500 back in december. Had the transmission serviced in January. Truck ran and drove great...until a few weeks ago. I had been driving the truck to and from work all week no problem whatsoever. Even that day, I had drove the truck to work and home several times with no issues. I parked it, went in to work. Came back out 2 hours later to go home and the the truck would not reverse. So I turned it off, waited a couple minutes hoping maybe I was just imagining things. I turned the truck on. Motor runs fine, but the transmission wont engage. There is no movement whatsoever in the [FONT=inherit !important][FONT=inherit !important]drivetrain[/FONT][/FONT]. What could it be? Im on a budget so any trans work I would be doing myself. this is just a standard 91 3/4 ton burb from what I can tell. It has the 4l80e I have determined from the 17 bolt pan. Any clues? Is this common? Where do I start? Help Please! This is my dream rig and I hate to see it sitting after only 6 months... I havent done any maintenance on this vehicle yet. My parents were driving it until theirs was repaired a couple months ago. I have done some checking since last night. here is what I have observed. And sorry but I am a newbie when it comes to servicing my own vehicles, but I am very mechanically inclined and I do my [FONT=inherit !important][FONT=inherit !important]research[/FONT][/FONT] as much as possible. ANYWAY, upon checking the trans dipstick I discovered it was dry! ugh! not a drop on it. I do not see any apparent leaks although there is fresh fluid on the tip of the breather hose? I believe its a breather hose. black [FONT=inherit !important][FONT=inherit !important]rubber [/FONT][FONT=inherit !important]hose[/FONT][/FONT] coming out of the top of the transmission at the rear where it meets the transfer case. Anyway, I filled with fluid, and when i attempted to shift into gear, no response still. after a min, the vehicle acted like it wanted to go forward, but seemed like it was in a higher gear maybe? seemed sluggish and hesitant to accelerate. No odd noises. Motor is in great shape sounds great. but shifting the column doesnt seem to affect it like normal....doesnt lower rpms or [FONT=inherit !important][FONT=inherit !important]engage[/FONT][/FONT] at all. So I turned it off for fear of making it worse? and had it towed back to my house. now that its home, i turn it on, and back to no response. sorry i should add the whole story i suppose...Had been driving all day no hard shifting, no overheating, no problems at all, drove like i imagine a new one would. 2 hours later when I originally started it after work, it would go forward, but when I attempted to shift into reverse, it still wanted to go forward, no matter which position the column was in. So i turned it off. waited a second. turned back on. no response from any location on the column. checked and discovered dry dipstick. filled with fluid and truck would seem to want to go forward, no reverse, but like it was in 2nd or 3rd maybe... turned it off. towed it home. turned it back on. no response again. I should also add that Ill be doing any repairs myself. No matter how technical or involved or tools necessary. I believe in learning everything I can about maintaining and repairing the vehicles i drive. Any helps would be appreciated. Thanks! I can upload any pics or answer any questions in return.