Supercharged111
Truly Awesome
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Accessible from the outside of the case--the 2--4 band servo assembly is the big, round, breast-looking thing just under the cooler tube ports. On some vehicles, you don't need to upset the trans mount, there's clearance between trans and trans tunnel for access. Other vehicles have tighter clearance, so the back of the trans has to be lowered, or you need a full bucket of harsh language.
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Servo upgrades are extremely popular--everyone and their brother has put a "Corvette Servo" in their 700/4L60/60E. That servo is for 2nd gear. There's also a big aftermarket servo for 4th gear. And, of course, folks sell a complete servo assembly with hot-rod parts for both 2nd and 4th gear.
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When my 4L60E case cracked, I lost 4th gear. I left the truck in 3rd all the way to the interstate where a hill greeted me as I merged. After the hill, I dropped the shifter into OD and nothing happened. I figured the rest of my drive was gonna be 1st and 3rd gear, but when I got off the highway I found I had 1-2-3, but the shifting was a bit off. At this point I was just praying it'd get me home and it did. The case cracked up by the servo, so I wrote the whole thing off and put in a 4L80E. Since your transmission stays full, I doubt the case is cracked, but wouldn't doubt some shenanigans down in the servo.