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no 4-3 or 3-2 downshift uncontrolled downshifts outside range of kickdown switch poor acceleration from stopped position parking pawl will not engage selector lever does not engage in r or p engine will not start in p or n position smoke in exhaust (fluid loss) fluid loss between torque converter & primary pump howling noise when changing gears (under full load) howling noise which increases as engine rpm increases 1st gear & reverse too loud 3rd gear too loud rattling noise at 1500 rpm in all positions except r light grinding noise in p & n positions rolling noises when driving in reverse vacuum control circuit Vacuum Control Valve (E300D & S350D) Vacuum Amplifier (E300D & S350D)
If the trucks moves in 1st gear it wouldn't be the rear end. In a manual transmission 2nd and 3rd are on the same shaft. If you are mechanically inclined or have a good friend that is go on-line to faxonautoliterature. Follow the instructions on the home page and for between $25 and $40 you can pick up a GM service manual for your transmission that will help you repair your transmission in stead of replace. They also list a service manual for the complete truck for $129 if you want. Hope this helps.
Check the idler and tensioner pullys for your serpentine belt. I suspect the whining noise heard earlier was due to the fact one was getting a bit stiff or rough turning. When you gave it that extra fuel, the sudden load may have finished it off. Sometimes they lock up, and sometimes they fall apart. Check those items first.