A few things you can try. If it's shuddering or got death wobble symptoms, I would check a few areas that have a lot of moving spinning parts first:
Look at the propeller shaft (center axle coming out of transfer case). There is shaft going to front diff and rear diff. Check if they're loose, make sure nuts are torque'ed to spec. Lubricate it, there are little holes where you can insert your grease plunger.
Check your wheel bearings. Lift the car up on each wheel, and see if you can wobble the wheel while it's bolted on the hub. If it's wobbling you have a loose bearing. You should replace the bearing and bearing races (new bearings come with the races), repack them, regrease them, and pre-load them properly.
You should check the CV axle. Check the joints, is it spewing a lot of grease everywhere?
Besides changing tranny fluid, you can also replace the front/rear diff and transfer case fluid with 75W-90. It's not hard, just open drain bolt, let it drip out, then fill it from the fill hole until it fills up to the fill hole. I would do everything else first before replacing tranny fluid, as I usually don't want to touch the tran unless you really have no other choice.... It's an expensive part and if you don't get the fluid just right it can cause issues with shifts.
I would definitely check out the ignition coils and spark plugs, as it's not too hard to get to, check their condition to see if there is potential for a mis-fire. It's best to get an ODB reader and scan for messages if you have one first before randomly replacing things. Spark plugs are cheap if you don't know the last time they're replaced can consider replacing them. If your spark plug is looking real burnt up it's time to replace them. Ignition coils are expensive for all 8, you will be able to see their condition when you take them off.
