Possibly going to make moving through a parking lot slowly a little difficult.
Those cars had an L6 in them so had a little more grunt to idle down, and stil pull a load.
But with a turbo, you are less likely to blow the tires off from it.
I having an L4 with mild cam, went to 4.62 gears, but with a turbo, I would have not done that.
You may be better off with a 4.1 gear set, if you can locate them, or even a 3.9.
Depends on how good of rear tires you want to run. R compound tires will let you hammer it hard with 4.3s, and get a good launch.
Price is cheap, but due to the weight the shipping will probably be twice that.
Mike, do you mean axle spline count ?
All the larger cars (Cedric, Gloria, some Maxima wagons), all had the same spline count as the truck.