Nylon or BRass S-cam bushings

2002 peterbilt 379 local driving dump truck. Sever duty.
Im ordering parts to replace all my rear S-cams and all the bushings.
Peterbilt trying to sell me meritor nylon cam bushings and said thats all they had and are better than the brass. I find that hard to believe. especially on a heavy local truck. I replaced the outer bushings last rear when i replaced all my slack adjusters and brake chambers. I just noticed the other day that all those cam bushings i install last time that were nylon are all shot. Yes i know i need to replace the cams and the inner bushings. for that, im gonna pull the hubs and do it the right way. The originals were brass fyi. Also, Im being sold meritor s-cams, is there any other that you guys recommend. They are about 85 bucks a piece from peterbilt

 

i was just going off of instinct and i needed reassurance. The nylon kit part number is meritor 8042. Do you have a brass cross reference number

 

is it 8042sb?

 

i tried to pull the cams when i replaced the slack adjusters. i even pulled the cam tubes to get all the wiggle room. dam things werent even close to clearing the hubs. Are you sure buddy?
Your input and help is much appreciated. When i tackle this, ill try again before i go pulling all the hubs

 

lester ill let you know how i make out when i start doing them. ill have some hub seals standing by anyhow