Here's the situation. I have a '86 k5 that is stock height, w/ heavy duty shocks & 31"x10.5" mudders, and a 10 bolt rear end. About two/three weeks ago I replaced the rear pinion seal. A day or two ago, I looked under the truck, and the damn seal is leaking again. I have had the truck off roading twice since I replaced the seal. I don't think the shocks or tires would affect heighth enough to affect this, but the only thing I can think has happened is that my axle has rolled slightly in the u bolts. It looks like the angle between the driveshaft and the rearend is off. The off roading I have been doing has required some "throttle manipulation" to conquer some of the more aggressive obsticles. God has a hard on for Marines, because we keep Heaven chock full of fresh souls!