I have a whining sound coming from the transmission. No slippage, drives great

Possible bearing in one of the drive pulleys. I have changed numerous alternators for this noise. Take the belt off and start the car. If the noise goes away you know it will be pulley related and not transmission related. If noise goes away, spin all pulleys by hand to determine the defective/noisy one

Hi whining can be caused by a great number of things , oil filter , automatic transmission, power steering , alternator bearings , waterpump, drive belts and many other moving parts on the engine and transmission pay attention to the tentioner of the fanbelts and related freewheels.

a whining sound typically has one of three sources; alternator, power steering pump, or transmission.

The code description for P1870 is "transmission component slipping" and usually means that the computer has detected a difference between what the input speed is and output shaft speed should be under certain conditions and tagged it as a slipping component. Usually it means that a clutch pack [usually direct drive clutch] or band isn't holding under a load and has started to slip. Sometimes the slippage can be observed on a scan tool during a road test but if the slippage is bad enough it may be noticable just driving it. Low transmission fluid level could cause this problem so make sure you check it before going any further. If it turns out that there is interal slippage then the transmission would have to come out and be repaired.

normally, the only part of your automatic transmission that will make a whining noise is the pump. it usually whines when iether the fluid is low or more commonly when the transmission oil filter is getting plugged up.

the power steering pump will also make a whining noise too.

turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).

if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.

if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.



oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.

If the truck was ran low on fluid to the point it clangs and bangs, the internal damage is done.
The best you can hope for is burnt bearings and hopefully the shafts are not scored. Disassembly is the only solution. Or a used transmission.

This must be the power steering pump that is going bad. You might have to replace it.

Cheers.

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sounds like the power steering pump is noisy.

Hi, this sound is most likely coming from the power steering pump. I would first, check the power steering fluid level to see if it is full. if its not at the full mark, add some fluid. If the fluid reservoir is full upon inspection and the whining continues, the pump may be damaged and the pulley on the power steering pump could be slightly out of sync with the pump housing.

The second issue could be belt slippage. i would do a tension check on the drive belt and pulleys as well. make sure there isn't any ware and tare on the belt and make sure the tension is to specs.

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I would take this tranny in for a total rebuild. this tranny may be headed for a major breakdown and, slippage usually is a great sign for massive transmission failure to come, considering that, you are burning transmission fluid.