Troywright68

Thank you. Looks like it's time to get oily and greasy. Thanks again

Hi everyone. I have a 2002 Mack RD688S with E 7, 350 HP with 621,0047 miles on it. Yesterday when I checked the oil I noticed it appeared to have diesel in the oil. The truck doesn't miss or smoke. So what could be causing this?

Hi, I have a 2002 RD 688S in  which I installed a 13 speed. The transmission had set up for a few years,I have been using it for about a month. Here is my question; what would make it switch from low to high range while idling in nuetral? Now it doesn't want to go back to low range?

Thank you very much. I really appreciate it 

I started with the 350

Hi, I have a 2002 Rd Mack which has had the bigger injectors installed. Which turbo do I need to increase it to 400 hp?