Question edited for a lot more clarity.
Question moved to model category.
The only way to do that would be fit an axle from a much newer model. It is easy enough to fit a new hub with a disc, but you have to hang a brake caliper somewhere, then you need the hydraulic pipes and some type of splitter to the master cylinder and front discs. The best bet is stick with the drum brakes or invest in a new truck. 1999 is pretty old.
Here are some video ideas though from people who say they did it..
i accidently drained some of the gearbox oil from my bravo b2600 1997. where is the hole to put more fluid back in there? how much should i put? and what fluid should i use?
Depends were you are, where I live any trailer with a ladened weight over 750 kgs requires brakes. Then when you do have brakes you are allowed to tow a trailer up to 1.5 times the weight of the tow vehicle.
If it's really rough, check for dirty or stuck EGR. It just slightly rough and also you have to depress gas pedal a bit to start, check IAC (idle air motor). If gas mileage is also bad check coolant temp sensor.
"charging"?
assuming you have got a battery warning light on dash? And it obviously doesn't go out. check the large red wire at the back of the alternator with a multi meter and you should have same voltage there as at the battery and its in good condition . If you have a good voltage there and a good engine earth then you need to disconnect the small wire at the back of the alternator - that should put out the warning light on the dash, This will prove the warning light circuit is ok. As long as your vehicle battery is ok and has a good voltage the only other thing that could be wrong apart from the alternator itself is the drive belt being broken or loose.
