Good point - the vette servo does help - but what will help most is getting that trans completely gutted and replaced with aftermarket components. GM has a design flaw in the 4L60E - steel shaft, aluminum drum. They heat up at different rates and a gap develops that allows fluid to pass and blows the 3-4 clutch pack. If you haven't dealt with it yet - operative word - here's what to watch out for - flaring. You'll be driving along and start noticing your engine RPM going up. If you don't notice - it's going to fry. You SHOULD be able to limp it home in second gear - most of the time. However, if you watch out for it, once it starts to rev, back out of the throttle and then slowly roll back into it. May take a few times, but most of the time that works to get you where you need to go.
I've had 3 of them fail on me. The first resulted in a 105 mile drive in second gear. The second resulted in a 95 mile drive in second gear. The third resulted in a 250 mile drive while pulling a pop-up trailer - in second gear. My current trans is a 4L60E case - everything else is aftermarket and it does much better.
Ah, yes. Been there, done that.
Coming home from a camping trip in Steamboat Springs 2 years ago. Wife, dog, 2 kayaks and probably 500lbs of crap on board, pulling a 2000lb travel trailer. Had just crossed Rabbit ears pass and was passing through the little town of Kremmling. Stopped at a red light, and when the light turned green, I I pressed on the gas and the engine revved but the truck didn't move. Dropped it from D to 3, nothing, then down to 2 and I was able to move. No warning lights, codes, transmission temperature had been fine (got just a hair over 200 ascending the steep grade going up Rabbit Ears but was back down in the ~ 175 range by this point.)
I was nervous as hell, seeing as how I still had to go through the Eisenhower Tunnel (11,000' above sea level) before getting home. I even preemptively called USAA roadside assistance to see if they would take care of our trailer in case the truck died (they said they would - both truck and trailer were insured through USAA.)
To my surprise, 2nd gear was no problem all the way home: 115 miles, up to the top of Eisenhower tunnel, then back down to Denver. The next week I drove the truck in 2nd gear to a transmission shop and they rebuilt it. No issues since then.