a truck i maintain is a 389 peterbuilt c 15 with an 18 speed in it, all is well until you have had the cruise set at 60-70 on flat ground for a few min, then it starts making an aweful grinding noise,(17/18 gear) at first you could just pump the clutch and it would quit, now sometimes it makes it seem like its sticking in gear, oh btw when the grinding starts the RPMs go up, we initally thought it was a clutch (even tho clutches dont make this grinding noise) and put a clutch in it, we have checked rear ends everything we can think of, im reaching out to yall because in 2 weeks the warranty runs out on this transmission, and i would like to solve the issue before that day comes.....thanks in advance
18 speed grinds while cruise is set
Discussion in 'Trucks [ Eighteen Wheelers ]' started by greasehorn, Feb 19, 2020.
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dustinbrock, Vegas unlimited and Rideandrepair Thank this.
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ill try it, at first we thought it was leaf spring bushings clear out of it and had the rear end sideways, we tried about everything we can think of
Rideandrepair Thanks this. -
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Maybe go faster seems like you should be going 80 to 90 in 18th gear.
Rideandrepair and Bakerman Thank this. -
Rideandrepair Thanks this.
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Noise on acceleration- too high, coasting- too low.
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Said it was something that was installed wrong during initial assembly...no chargeSAR and Rideandrepair Thank this. -
Sounds like the T/O bearing
Rideandrepair Thanks this. -
Only thing I can think of internally that could make the RPM race and cause a grinding sound is if the teeth on the splitter dog clutch are worn/damaged and its being thrown out under torque. Once you let off the throttle, air pressure on the piston puts it back into engagement because its not fighting the torque trying to pop it out.
magoo68 and Rideandrepair Thank this.
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