What makes a diff whine?

A “howl or whine” during acceleration over a small or large speedrange is usually caused by worn ring and pinion gears or improper gear set up. “Rumbling or whirring” at speeds over 20 mph can be caused by worn carrier bearings. A “Rumble” while cornering or turning may indicate bad wheel bearings.

What causes a grinding noise in a Chevy transmission?

Transmission grinding noise – sun shell (planetary gears) may be damaged. Chevy will drive in 1st and 3rd only but not 2nd or 4th gear – Sunshell may be damaged, or splines are sheared off, servo seals may be worked out, bands themselves could be worn out.

Why does my Chevy Silverado make a noise when I stop?

A steady whine from the front that is best heard while stopped or during low speed turns. With the steering wheel straight, the whine may be null or low, but the noise increases noticeably when the steering wheel is turned. This is often caused by low power steering fluid, which indicates a leak that must be corrected.

How can I tell if my car is posi?

Locate two lugs, or ears, extending out from the bottom of the gear casing approximately in the 4 o’clock and 8 o’clock position. This will firmly identify the unit as having come with Positraction from the factory. Measure the gear casing horizontally, end to end, across its widest point.

Where does the lifter sound come from on a Chevy Silverado?

You can hear lifter click best around the top of the engine, and isolate the noise with a stethoscope against the valve cover. It will occur at idle and increases as you rev the engine, continuing even when the engine is warm. Valve lifter noise is detrimental and should be addressed quickly.

Why does my Chevy Silverado make a squeaking noise?

Repetitive squeaking indicates the belt is not running true, and prolonged squealing means that the belt is overheating. This noise is typically caused by a mechanical problem, either a worn auto-tensioner or idler pulley.

Why is my Chevy Blazer making a noise?

In the case of an automatic positive traction type differential such as the one on my 2004 Chevrolet Blazer, noise diagnosis can be more complicated, because of the additional components involved in the locking operation. These types of rear ends have a clutch pack that transfers power to the wheel with the most traction.

Why does my 4×4 front differential make grinding noise?

lift up on the axle shaft to remove it and this is what you get. you can see where the gear is a bit chewed up from improper engagement due to faulty vacuum switch on the transfer case. if your front end randomly grinds when on the highway or whatever this is what is causing the noise. next lift up on the shift fork assembly.

What does cold start knock sound like on Chevy Silverado?

Be aware that the radiator cooling fans may operate at any time. Cold start knock is generically called “piston slap,” which is common in Vortec engines. For the first 30 to 60 seconds after a cold start, the short-skirted pistons rock inside the cylinders and slap against the cylinder walls, sounding rather like a diesel engine.