I have an '87 Blazer and I just put a 4" lift and 33s on it this weekend. It has 3.08 gears and my 4.11s came in today. I drove it around town with no problems and then I drove it on the highway for about 25 miles yesterday. When I slowed down, it wouldn't down shift into first. When I manually shifted into first, it didn't want to shift to second. When the rpms got really high, it finally would shift. I drove it today and its still shifting hard to second at high rpms and not wanting to down shift to first. So, did I overheat the transmission or could it be anything else? I did check the fluid level and it was okay. Should I try a filter and fluid change? I also need to drive it about 45 miles to get the gears changed.