i,m thinking of buying this complete combo ,what are the things i have too look after (the weak spots) i now have the th350+np203 parttime combo it makes about 2500 rpm, by 60 miles an hour. now will the rpm,s go down or up ? iv,e got 4.88 diffs(ARB) and 38.5x14.5x15 inch Super Swampers under the car. Patrick . The Netherlands.