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Discussion Starter #1
The tranny is whining. Sounds like the typical power steering pump whine but it is not. It is constant and increases and decreases in pitch with motor speed. I believe it to be the pump in the transmission. Could there be other causes? It seems to function just fine and there is no discoloration or smell to the fluid. The truck has 80,000 miles. Not a lot of money to spend but was thinking replace only the pump and put it back in service instead of waiting for it to fail and be committed to a full rebuild. Opinions welcomed.
 

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Sounds like a pump. IMO if your going to pull the trans out why not update with better parts. I know its more money but what if something else goes bad in just a few months/miles. There are so many upgrades for the 4L60E you can make them last almost forever.
 

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Discussion Starter #3
I have been kicking around the idea of replacing or updating the transfer case pump that been prone to wear thru the tailshaft. Might as well rebuild the trans. while it is not broke but before it goes belly up. What are the typical upgrades for the 4L60E? I am not running big tires or modded motor but do plan on getting travel trailer suited for the tow rating of the truck.
 

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If you go to TransGo or Oregan transmission parts they have alot of the upgrades.
 

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Please feel free to keep us updated with the fix. If you have any further questions or concerns do not hesitate to contact me. Thank you.

Tricia, GM Customer Service.
 

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Discussion Starter #6
Thanks for the replies. The fix will likely occur sometime later this summer but I will let all know what exactly the problem is/was.
 

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dpeter, Hey! So what happened? I'm having what sound to be the exact same problem. My truck is a 96 Silverado but the transmission is only about 8 years old. I towed a travel trailer 750 miles and it started whining in the last 50 miles. The whine only occurs when the truck is in R, D, 3, 2, and 1. Not P or N. The whine pitch matches the RPM of the engine, increasing in pitch as the RMP increases, lowering as the RPM decreases, and quick dropping in pitch as the transmission goes up a gear. TYVM! - Allan
 

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Allan, this original post is six years old. You'll likely get better response if you start a new topic.

BTW, Howdy and welcome!
 

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Discussion Starter #9
Bringing back the dead. I just lived with the whine for the longest time and fixed it a couple years ago. My bad for nor updating the post. Turns out it WAS the power steering pump. Replaced with a reman and after a week it came back. Returned that and bought new AC delco and have not heard another thing. Try taking the serpentine belt off the steering pump to make sure the whine is still there or not and go from there. Can't be of much help in the transmission world as that is above my pay grade.
 

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Take care with the belt off. Does your serpentine belt drive the water pump? Don't go for a test drive and don't run the engine long.

Ted
 
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