Hello All,
I am by no means a mechanic, however, I would like some input before I go to a mechanic to get my truck checked out. I am not totally convinced that my issue is 100% a transmission issue, however signs do point to the area. When accelerating starting at approximately 40 Mph and 1500-3000 RPM I hear a pretty pronounced rattling ( kinda like a can with a couple of bolts shaken..). As best I can tell, it seems to be coming from the middle left area under the truck, most likely close to the tranny. The noise has gotten a bit worse over the last couple of weeks. It seems I can avoide the noise completely by traveling at less than 50 mph on a slight incline, and I dont seem to hear anything when accelerating on a decline. I dont hear the "rattle" while driving the back roads, only when on the freeway. The noise seems happen mostly when more force is needed to move the truck on an incline at 40
++ MPH and higher RPM. Driving in OD seems to reduce the noise a bit as well. The truck shifts just fine, and Im not noticing any performance degradation, however I am very concerned about the noise. Also to note is that the Rear Diff seems to be leaking more than usual, I am planning on topping it off to see if that helps, since I cant be 100% certain that the noise is coming from the middle left Might be coming from the rear diff? I doubt it though. Any inputs would be greatly appreciated..Thanks,
-Tim