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both my trucks are the same way with TH350s. really light on the gas like i prefer to drive then they just shift too early. ive learned to give them enough gas at the right time to "drag out the gears" a little bit longer. you will get the hang of itim not sure if u can get one of those adjustable vacuum module/regulators for a 700r4 or not?
Our 1997 Blazer has a 4L60. It is the TH700R4 evolved.Shift points are pretty similar as yours. Our Blazer shifts into OD around 45mph and final torque converter lock is around 52mph.I like it that way. I'm old school and don't rev my engines. It took me a long time to convince myself that the LS engine in my wife's truck really didn't mind 4,500rpm, and 6,000 is nothing. But then again I've spun my 454 7,000rpm more times than I can count. My 454 isn't stock either. Hehe.Guy I work with has a 2015 Silverado crew cab 4x4 that I put about 20 miles on last week. It's 6sp transmission is nothing like the older 4speeds.
The shift point for each gear will depend on the load. If you're light on the pedal, then the trans will shift through the gears quicker.....which may be what you're experiencing. Try laying into it on a freeway ramp, for example, (WOT).....it will likely hold onto each gear longer. The 350s and 400s are the same. I'm often amazed at the range each gear has.....which is what makes them such great transmissions. Unless you're tuning for the strip, rock crawling, or some other specific purpose.....it's unlikely that you need to open the transmission for adjustments. Just make sure you're running a high quality ATF.