I am in desperate need of some input. I have an 85 K5 Blazer six inch suspension lift three inch body lift 40" TSL 350 motor with truck avenger carb and a th700R4 transmission. Now for the problem the truck has been sitting about a year and a half at my parents barn and has not been moved in a year and a half. Before I parked it a year and a half ago it ran great no engine trouble and no transmission trouble at all whatsoever it all ran smooth. Well I finally rebuild the carb after all that time sitting and change the oil and filter and put new air cleaner on it and start it up it runs great. I go to put it into drive and I hit the gas and it stalls like I have my foot on the break. Start it back up and rev a bit then try again it moves but its like i'm trying to push a house with it. The engine revs high and it moves forward but only if I'm really giving it some gas i let off the gas and it seems to want to stall but only when its in gear. So I try reverse seems to reverse ok but I can still tell something is not right it takes too much engine power to move it. I put it in 4 wheel drive and now it moves a little easier but still feel that over exertion in the motor and feels like i'm pushing a semi. I notice that the back right tire seems to be moving faster than the left sometimes and after driving it about 200 yards I noticed a smell that smelled like burning brakes. Question is do I need a new tranny or are my brakes bound up somehow over time? And yes I checked the emergency brake it was off.

 

I've never delt with your problem before but it sounds like you might have seized something in your axle. Your right tire will always spin faster on a stock 10 bolt but if it's a large difference in rotation that would probably be a sign of something dragging. i would prop the right side of your rear axle up and hit the gas to see if there is noise and/or heavy drag. If nothing appears on the right you could spin the left by hand and see if you notice drag. If you left your E-break on in storage it could have caused the breaks to seize in place also.

Not sure if this helps but i hope it does.