It's actually not that bad of a job to tackle, especially if you have a trans jack as you can adjust for castor/camber to balance the transmission perfectly when you go to re-stab it. Two pairs of 6 ton jack stands and a decent trans jack from Harbor Freight. I'd also have a half inch wobble socket (15mm) for the bell housing bolts along with a 24" half inch extension to get to the 12 o'clock bolt. If it's a 4x4, you have to jack it up a bit higher to deal with the TCase, that's all. I can remove a 2WD GM trans (doesn't matter which type) within an hour or less and reinstall one at around the same length of time by myself (and I hardly ever do it as I do all bench builds and never see customer vehicles so only talking about my trucks and those of family and friends).It’s a brute job by yourself on jack stands and a trans jack. Another Esky owner just did his trans on his 07 and sourced it from AutoZone shipped to the store. Always inspect them before you leave the store. The first one he picked up had a cracked bell housing. That could happen but there was fresh paint in the crack.
Assuming the OP is going to keep the vehicle, his best bet is to arrange financing then purchase a GM remanufactured unit and have a dealership install it. This way, everything is GM and if they screw it up, they can order a new one and schedule him in to swap it. He can save money if he does the R&R himself (probably a grand or so). It doesn't really matter what's wrong his current transmission as it's going to stop working all together sooner rather than later so hopefully he can get his ducks in a row before it does.
I'd never buy a transmission from Autozone or any of these general parts stores as they use overseas labor for a lot of their stuff, do the bare minimum and install the cheapest crap they can get away with.
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