Anyone recommend any shops or other places to get this done or buy a drop in unit?
As it has been stated at the top of this page....Big HP numbers are only relative when it comes to putting it to the ground. It's always been a point of contention with me. Everybody goes out and decides that they need 700+ Hp on the street, and build an engine combo capable of doing it. Then, after spending the money to do it, drive the car to and from the Saturday night cruise-in.
And never fully realize the power.
All 700 HP will do is spin a tire that much harder, make that much more smoke, and put the engine against the rev limiter that much quicker. Until you decide that you are really gonna compete with the car in an arena where either you couple that power to the track at the jump (drag racing), or let that dog eat in some "Silver State" style top end speed contest, the money you spent to take the car from where it is now to where you wanna be is a bunch of wasted dollars.
But it's your wasted money, you are free to do with it how you see fit.
If you are building the car as a streeter (which you have said that you are) a 31 spline 8.8, with a T lock or better diff, is out there already to drop in your car in a JY.
It'll come with 5 lug 28 spline axles and the accompanying differential. It'll already have disc brakes. All you gotta do is find an SN 95 Gt.
As for the axles, gears, girdle, and differential upgrade. Strange, Currie, Moser, North race cars, as well as a multitude of drag race fabricators (Racecraft, Wolfe) can supply you with the rest of the stuff.
The brakes can be upgraded using OEM Cobra stuff, and sourced from Rock Auto.
I'm guessing that you want the 9" ends installed to eliminate the C clip eliminators that you'd have to use instead,...but again, I'd ask why? I'd bet 90% or more of the guys here that are making big power and use the eliminators, or that are still using C-clips. And scores of Chevy boys with their 10 and 12 bolt rears doing the same. Axle breakage where C clip eliminators are necessary are mandated when you are repeatedly beating the thing on a dead hook traction surface at a drag strip........ period. All else,..is because you prefer the peace of mind. A c Clip eliminator is a DIY mod. A 9" end is not.
And you are not building the thing for that. A T/A, and PH bar and heavy front and rear sway bars are X cross/road course mods. If you build the car for X cross/road course, It will suck as a drag car. Throwing a rear set of sticky tires on an otherwise stiff
suspension car set up for going around a corner, will be less than optimal at the strip.
Read: Hooking hard enough to break an newly installed, aftermarket 31 spline axle will be pretty unlikely.
If you just have to have a serious duty rear that you can buy that will fit supplied as a unit, you already found the guy that will do it for you. (Moser) If you live in a big enough market where there is a race car fabricator then you take the car to them and they charge you a similar amount of money and will keep the car for a couple of months or more to do it. (just search for other threads where guys have left their cars in chassis fabricator purgatory).
Or you save yourself the money, Buy a JY 8.8, Do the rest yourself, use C clip eliminators if you have to, and save yourself about 3 grand.