Well guys my truck started making a knocking sound, but its coming from under the truck under the motor... I know its not the lifters, what else can it be??? I dont have any problems with oil pressure everything seems to be ok, only thing I did was put my stock converter on but I dont think it has anything to do with the converter I still drive it and no problem but the noise wont go away, what can it be????

 

how many miles are on your truck? might be the crank. are the converter bolts tight?

 

That is what I was going to say, check your converter bolts.

 

Im not sure im taking it to get checked today, what else can it be guys??? if its the crank thats means my motors is done? btw its a 6.0 lq4 and it has around 80 thousand miles

 

to the top

 

cracked flexplate?

 

See my "big problem" thread in the general section. I have this same noise, rattley/grinding when I drive. Motor has good oil pressure, revves good, and the trans shifts as normal. I've got it narrowed down to a defective starter hanging up on the flexplate, loose tq. converter bolts, and a broken flexplate.

 

Might be a rod bearing