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1999 Chevrolet Tahoe transmission

Tiny
DCKY320
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 154,000 MILES
I was on my way into work, traveling down the highway at about 60 miles an hour in 2WD mode. All of a sudden my RPMs shot up and I lost forward motion. The truck won't move in any gear either 4WD or 2WD mode. I pulled the dipstick and my transmission fluid is now way over full. I don't have any codes showing.
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Sunday, February 22nd, 2015 AT 2:43 AM

11 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Overfilling a transmission can be bad.

Let the transmission cool down and drain some of the fluid and retest if it works.
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Sunday, February 22nd, 2015 AT 5:32 AM
Tiny
DCKY320
  • MEMBER
  • 17 POSTS
The transmission fluid was between the full and low dots on the dip stick before this issue. Now it is very over full. Have had no issues with the trans before this. Many other problems but this is the first for the trans.
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Sunday, February 22nd, 2015 AT 6:00 AM
Tiny
DCKY320
  • MEMBER
  • 17 POSTS
Not sure if this would matter but was driving on a snowy slushy highway when this happened.
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Sunday, February 22nd, 2015 AT 6:01 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
What is the color of the transmission fluid?
When transmission fluid heats up, it would increase in level.
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Monday, February 23rd, 2015 AT 9:38 AM
Tiny
DCKY320
  • MEMBER
  • 17 POSTS
Kind of a dark red to light brown. Found that today there is even more fluid in it then there was yesterday when it first broke down. Seems very watery as well, literally drips off the dip stick quickly.
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Monday, February 23rd, 2015 AT 11:45 AM
Tiny
DCKY320
  • MEMBER
  • 17 POSTS
Also found that the transfer case will engage my 4WD low in any gear including park where it would on shift to 4WD low in neutral.
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Monday, February 23rd, 2015 AT 11:46 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
There is a possibility the transfer case has failed so you need to investigate further.
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Monday, February 23rd, 2015 AT 10:57 PM
Tiny
DCKY320
  • MEMBER
  • 17 POSTS
I pulled the pan off the transmission and it was clean. Some sludge on the magnet but nothing terrible. Filter seemed unusually heavy when I pulled it off. Was wondering if a torque converter failure is a likely problem before I pull the whole trans.
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Friday, February 27th, 2015 AT 7:41 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Check the filter to see if it is clogged not allowing transmission fluid to flow through. I have encountered situations whereby the filter element is dislodged and blocks the fluid passages.
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Saturday, February 28th, 2015 AT 2:23 AM
Tiny
DCKY320
  • MEMBER
  • 17 POSTS
Update to my transmission issues. I finally have everything apart and pulled the torque converter to replace it. When I went to install the new one I looked in for the ears on the front pump, I found there were none. Upon further investigation I saw pieces of the front pump gear laying in the hole. Now I have to find the parts to rebuild the front pump. Seems auto parts stores around me don't even know what I am talking about let alone have the parts.
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Wednesday, March 11th, 2015 AT 12:01 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
I believe you are referring to the oil pump.
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Friday, March 20th, 2015 AT 12:34 PM

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