Do i need any specialized tools to take the front halfshalves off and replace the boot?

Does the '89 GL-10 have a top speed limiter?

You'll need a 36MM socket, a 3/16" punch, and a piece of pipe or a socket to knock the axle out of the bearings. I've got a special cotter pin puller that works very nicely at getting the axle nut pin out, but a pair of pliers and a screwdriver should do it just the same.

 

I don't believe there's a speed limiter programmed into the ECU - the biggest limiter of speed is the fact that these old cars are slow and boxy.

To dis-assemble axles you'll need snap ring pliars (or maybe a screwdriver) and it helps to hold the shaft in a vise. Lots of disposable rags and gloves that go up to your elbows are a good thing. Love that CV grease. Might want to put a box or something under the the axle incase the bearings fall out as you take it apart. The balls like to roll under cabinets.