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Hrm, where to start... Well, as I'm sure ya'll know, I replaced my transmission because my previous one burned up (see http://www.gmtruckclub.com/forum/showthread.php?t=9192 for more information on that). So, my uncle and I put the new rebuilt transmission in my truck and things started looking up. Before we put the rebuilt tranny into the truck, we filled the torque converter as best we could. I followed the procedure in the haynes manual to readjust the TV cable, in fact, I started from scratch and readjusted the cable 3 times to make sure it's right. From mile 1 with the new transmission it seemed like it shifted a little bit late from 1st to 2nd gear. Well, Friday night I went and picked up a very light 5x8 box trailer. I then loaded it with a fridge and dryer, nothing heavy and towed it around 50 mins away. About halfway through, the transmission seemed like it was shifting later and later for 1-2 and 2-3. It got to the point where it would shift from 1-2 at around 25mph and 2-3 at around 50mph. It barely ever got into 4th gear at all. At that time, I pulled into a gas station and checked the tranny fluid. Well, it was a TINY bit low, so I bought a quart of tranny fluid and filled it up. That didn't help anything. I got the truck home through lots of taking it easy. I did get it into 4th gear on the interstate through lots of coaxing. My buddy who went to school for trannies, but hasn't worked on one in a while, thought it could possibly be either a bad torque converter or a check ball, spring or servo that is dislodged or broken in the valve body. Any ideas as to what's screwed up in the tranny? I'm clueless, but something's messed up.