RPM specific noise. No tachometer so we’ll go based off of gear and speed. Occurs when decelerating in:
The Issue:
As previously mentioned, there’s this whirr in the driveline. I’m too in my head about this and can’t tell if it’s the diff or if it’s just the engine braking / transmission braking. Does not happen when clutch is disengaged, turning corners doesn't exasperate it, and only happens at specific rpms.
Great truck, engine clean and purrs like a kitten. Clutch is going on 4 years old.
In first or second gear, between 5-10mph, truck bucks and hesitates some, almost feels mechanical like it’s in the driveline somewhere? May also be dirty fuel injectors so not too worried about this.
When I changed the diff fluid it was black. Plug had minimal metal shavings, just 1mm of very fine metal. I’ve checked this after another 3k miles and it’s clean still. NO CHIPS or cracks or uneven wear to the eye.
About a month later I got the wise idea to change ujoints. It was hell. Took 4 days. Got it back in lubed the slip yoke and the bucking stopped mostly. Was rusted firm to the diff yoke, took a bit to smack it loose.
Got it back together, hit 85mph on the highway, everything works great. Typical road noise, no shake or shimmy and life is pie.
Now 2 months later, I can’t tell if this whirr has always been there or not. Could be :
What am I missing here? I’d hate to take it in and be laughed out bc it’s just road noise lol.
- 2nd gear at 15mph
- 3rd gear at 27mph
- 4th gear at 47mph
- Changed oil and filter
- New tires all around
- Lubed chassis
- New timing belt and front seal
- New fuel pump and filter
- Changed differential fluid
- Changed transmission fluid
- New sparks, wires, and coils
- New ujoints, lubed slip yoke
The Issue:
As previously mentioned, there’s this whirr in the driveline. I’m too in my head about this and can’t tell if it’s the diff or if it’s just the engine braking / transmission braking. Does not happen when clutch is disengaged, turning corners doesn't exasperate it, and only happens at specific rpms.
Great truck, engine clean and purrs like a kitten. Clutch is going on 4 years old.
In first or second gear, between 5-10mph, truck bucks and hesitates some, almost feels mechanical like it’s in the driveline somewhere? May also be dirty fuel injectors so not too worried about this.
When I changed the diff fluid it was black. Plug had minimal metal shavings, just 1mm of very fine metal. I’ve checked this after another 3k miles and it’s clean still. NO CHIPS or cracks or uneven wear to the eye.
About a month later I got the wise idea to change ujoints. It was hell. Took 4 days. Got it back in lubed the slip yoke and the bucking stopped mostly. Was rusted firm to the diff yoke, took a bit to smack it loose.
Got it back together, hit 85mph on the highway, everything works great. Typical road noise, no shake or shimmy and life is pie.
Now 2 months later, I can’t tell if this whirr has always been there or not. Could be :
- Road Noise
- Wheel Bearing (?)
- Diff Bearings or
- Diff Loose Preload
- Ring and Pinion worn
- Effed ujoint
- Deceleration
- Clutch engaged
- At specific RPM
What am I missing here? I’d hate to take it in and be laughed out bc it’s just road noise lol.
