It will work with ease and many many people on here will back me when I say this. How many miles is on it and how much can you get it for? I got mine with a little over 60K miles on it delivered to my door for $250 but I got damn lucky. Swapping out electrical internals is something my 8 year old son was helping me with. Doing the J-Mod is something that may seem intimidating but with the 98, it's very simple to do. Only takes two different sized bits. 3/32's and a 7/64th bit and I'll provide you with the drilling diagram that shows the holes you will be making bigger. The holes are already there, you're just enlarging them to allow better fluid flow. Better 2nd, 3rd gear and it will engage in reverse right then with no hesitation.
The cost of the two gaskets needed for the J-Mod are around $3.00 each and you will need two. Get those from Maxx (check on the right for his ad) and he will ship you exactly what you need. When you get done, you'll be like "is that it" and then it will be install time and then the fun begins but if you have help, it's nothing to it.