Mufflers

I was just over there typing when I realized that we were chasing each others tails here, go back to your motor mount page and look at the pic I posted. All of the bushings you posted pics of need replaced and are definitely worn enough to be contributing to your noise problem, pics 3,4,5,6 &7 all show signs of metal to metal contact, they all need replaced any way so I would start there, and no one ever believes me until they do it but if your chassis has more than 600,000 road miles on it (or 4-500,000 on-off road miles) replace the front cab bushings also, you will be amazed at the difference in ride/noise improvement.

 

How hard is it to replace the cab and motor mounts? My dad said on his 379 the motor mounts were a pain

 

Not too bad on my old 379 but on my t600 not so much. There isn't enough slack in the heater/a/c lines to jack the cab up high enough to get the new bushings in, so I used a 4x4 cut to fit and used a floor jack to hold the cab up and unbolted the bottom part of the mount from the frame, kind of backwards but it was a lot better than unhooking and or breaking the heater/a/c hoses.

 

Good deal...

 

You still have that Grand Rock M-922?
Hows it holding up, weather,rust,performance issues,drone,etc.

 

I know this thread is about 5 years old but if anybody has had one of these mufflers let me know you thoughts on their overall performance.

Thanks rb