Chevy Truck

Tiny
CHEVYALWAYSBROKE
  • MEMBER
  • 1999 CHEVROLET ASTRO
  • V8
  • 4WD
  • AUTOMATIC
  • 200,007 MILES
Why is my transmission slipping and my spedometer going crazy?
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Tuesday, April 5th, 2011 AT 3:20 AM

8 Replies

Tiny
RIVERMIKERAT
  • MEMBER
Has the transmission ever been serviced? Check the fluid. If it's brown, it definitely needs flushing. If the problem has been occurring for awhile now, you may need to replace or rebuild the transmission. The speedometer issue tells me there is either a problem with the computer or with the vehicle speed sensor.
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Tuesday, April 5th, 2011 AT 6:35 AM
Tiny
CHEVYALWAYSBROKE
  • MEMBER
It had the transmission replaced once. It was just all of a sudden the truck has always shifted GREAT! And the speedometer has never acted up. I got in it to go home and at about 35mph it just started slipping bad then I came to a stop, took off again and it slipped a couple more times then was fine. It has never slipped at all before.
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Tuesday, April 5th, 2011 AT 7:54 AM
Tiny
FIXITMR
  • MEMBER
You could try testing replacing the neutral safety switch as that tells the trans controls what gear it is in? I've heard of other vehicles fixing issues by replacing this item. Speed sensor also. Try to find out if there are any other sensors related to trans function.
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Tuesday, April 5th, 2011 AT 9:01 PM
Tiny
RIVERMIKERAT
  • MEMBER
How many miles on the new/replacement transmission? Since the speedometer is electronically-controlled, the problem with it is definitely electrical. Make sure the connectors on the back of the dashboard are firmly seated. Do the "wiggle test". Get a multimeter, set it to read resistance and wiggle the wires and connectors while watching the meter closely. You should see no fluctuation in the readings.
The slipping problem could be quite a few different things. Check the fluid for color and smell. If it is brownish or smells burnt, get it flushed. If you have an Aamco near you, they do free diagnostics on transmissions.
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Tuesday, April 5th, 2011 AT 10:05 PM
Tiny
CHEVYALWAYSBROKE
  • MEMBER
I checked the fluid and it is pink! Seems normal. Both of these problems occured at the same time the truck always shifted perfect and the speedo was just fine. I just drove it again and it will shift to 2nd fine but keeps going back and fourth between 2nd and 3rd and slipping in between shifts
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Tuesday, April 5th, 2011 AT 10:47 PM
Tiny
RIVERMIKERAT
  • MEMBER
Find somewhere that will do a free diagnostic. Shifting back and forth between 2nd and 3rd tells me either speed sensor or vacuum modulator, if so equipped.
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Wednesday, April 6th, 2011 AT 12:48 AM
Tiny
CHEVYALWAYSBROKE
  • MEMBER
Ok thank you for your help
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Wednesday, April 6th, 2011 AT 1:26 AM
Tiny
RIVERMIKERAT
  • MEMBER
My pleasure
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Thursday, June 2nd, 2011 AT 4:08 AM

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