I drove my truck about 400 miles round trip this weekend and it did pretty well (244600 miles) however about halfway there a noise started when accelerating. I pulled over to check things out and nothing appeared to be irregular. When I got home, I noticed that my pinion seal blew up and the third is leaking. I recently replaced it and both axle seals (axle seals held up). At one point in town, my truck slipped out of first. ..which has happened a few times before. Could the noise be coming from the tranny? ideas? When I let off the gas the noise goes away and then comes back when pressing the gas pedal - even had sort of a scraping sound at times. Thanks in advance for the help!

 

Have you checked the u joints?

 

Ehh well there is some fluid on the front drive shaft and it feels like the noise is coming from that area...I rotated the shaft and it did so OK. I tried to move the u joint but there wasn't any play..