hi all -- 87 k5 silverado blazer, tbi 305, 700r4, np208, 32"x10.5, 10 bolt, 3.11 (i think) gears. 150k miles I've recently acquired a boat that I've been lugging around with the rig. I already know not to tow in O/D, and everything seems to be working out really well so far. The only thing that I've noticed is that I seem to be loosing somehting in the drivetrain when I'm goin up an icline at a relatively slow speed. now I know it's not gunna race up the hill with almost 6000' of boat behind it, and I dont have a tach, but it seems to be getting up above the middle of my normal rpm range just to hold speed going up a hill. for example, crossing a bridge on the coast with the hump in it for boats to go under. around 15-25 mph it really takes a lot of gas to keep moving and a whole lot if i need to accelerate. there are no signs of tranny wear or overheat in the fluid, although my pesky oil leak gets a little worse while pulling. I'm not overly concerned, I was just wondering if this is a sign of anything (old torque converter, tranny old, etc.) any thoughts?