I have a 1988 YJ. I got a quote of $900.00 for parts and labor ( new pressure plate, clutch disk, slave cylinder, pilot bearing) from one shop. Another shop qouted me a labor only rate of $600.00 if I provided all of the parts.
Preen is a pre-emergent weed prevention product. It prevents weed seeds from germinating instead of killing existing mature weeds. Preen works on a wide variety of annual weeds, but it won't have an effect on perennial weeds because they already have established roots.
The active ingredient in Preen is trifluralin, which was sold originally under the brand name Treflan. It acts by killing weeds when they germinate by preventing the shoots and roots from elongating. It is generally safe to use on legumes which are planted from seed (beans, peas), and onion sets and potatoes. It can be used on tomatoes, peppers, and members of the cabbage family that are transplanted into the garden.