i have an 86 k5 blazer with 10 bolt front and rear and a np203 transfer case. i am having problems finding the right length driveshaft. my springs are sagging and are about 2 inches away from the bumpstops. i have 2 driveshafts one is too long and will not fit, the other fits but only has about 1/2 inch left before it bottoms out. is this enough? do i need a shorter driveshaft?