I've been driving for less than a year. Recently my 2016 Mack pinnacle day cab I started having a grinding noise from the gearbox. This happens in the upper gears 8th 9th and 10th mainly. It happens when I'm trying to accelerate in any one of those gears when I press the throttle go be a loud grinding noise and a spike in RPMs and no increase in power. On the plus side there's no loss of power. Any ideas would be greatly appreciated
When I'm driving an eighth, 9th or tenth and I press the throttle the grinding noise begins in the RPMs will jump 2 to 300. I assume that's because I'm applying throttle obviously but the power is not providing torque. That's just my guess.
I'll recommend that to the mechanic when I bring it in. It's a company truck I just don't want to be on the side of the road
RPM spike would be the clutch slipping. Maybe clutch is making noise. I never had one make noise but when they wear out they slip
If the rpms are truly rising, without the truck speeding up, it will be something to do with the clutch. I can't explain the grinding noise, but if it is gaers and it slips, you would be dead in the water.
Putting it into the shop tomorrow. I just wanted an idea how to explain it to the breakdown Department. Thanks for all the advice. I had a feeling was along those lines but I wasn't certain
