379 peterbilt problems

i have a 96 379 with 404 eaton rears 3.55 ratio 15 speed transmission today my driver was goin down the road and it started shaking in the rear end and hoping all the tires are nearly new brake drums look good nothing busted all wheel bearing seem good u joints seem good carrier bearing looks good so we pulled both rear ends out they look good but there was a two or three peaces of metal in the oil out of the front rear but everything looks good crank the truck drive shaft out wint threw every gear and nothing so what could be my problem and also i need a diagram to tell me what oil temp gauges go to what i its got 4 oil temp gauges i now wich one is the engine oil temp but have no clue wich one goes to what rear end or the trans one of them was running over a 150 degrees bob tailing seems hot to me any help would be great thanks

 

i took the divider apart it all looks good i dont now what else it could be

 

well to be honest they dont look like nothin ive ever seen come out of one they kind of favor a peace of a roller but ive lookt every gear and bearing over real good but see nothing wrong with any of it

 

i didnt thats the only thing i didnt look at is there spider gears in there ive never had one apart