So last week I fired up the truck and pulled it out of the heated garage and soon after got stuck in the drive way in the 3 foot drifts. So I get on it a little to get through. While going down the road it feels like its down on power and notice that when the truck goes into overdrive it started shaking. I stop and get out to look at the wheels assuming that they are packed with snow. They aren't, but I do notice an oil slick the size of a basket ball. So I turn around and go home and everytime it goes in od it starts shaking like its missing under load. So I get home and order a o ring kit and bellowed up pipes thought that while I had the turbo off might as well fix the up pipes. Anyway got the thing all back together and no more oil leaks but go for a ride down the road and its still down on mowe and shaking when in overdrive. A little back ground on the truck, its a 2000, regulate return, Swamps 315cc injectors, ball bearing turbo, deleted ebpv, suncoast converter, rebuilt trans, and more. The truck has 90k miles and I've owned the truck since 7k miles. The truck is due for an oil change and a little low from the leak but isn't off the cross hatching on the dip stick. Things I've checked are that there is no oil in the fuel filter housing and fuel pressure is 70psi.