1988 Chevrolet S 10 4 3 Motor Automatic Transmission Works Untill Start Downhill

1988 CHEVROLET S-10
200,000 MILES
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FLASH25205
  • MEMBER
  • 2 POSTS
I have a 4.3 motor automatic transmission the transmission works untill I start going downhill and then the transmission acks like it is go in netural, you can downshift and it will not slow the truck down, I can give it gas and sometimes it will engage the transmission again, Once I get on level ground or up hill it starts working good again. You can go backward down a hill and it works great. You have to have really good brakes when you go down a hill. any help thanks
Nov 17, 2012 at 7:17 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
With that mileage-Let me ask you this -How long since you have the transmission serviced-don't recall check the tranny fluid level and condition -start here and then report back -
Nov 17, 2012 at 7:50 PM
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FLASH25205
  • MEMBER
  • 2 POSTS
Just bought the truck so un sure about the service part, checked the fluid it looks good and full
Nov 18, 2012 at 5:07 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
How did you check the fluid? If you're checking it like the oil its not the correct way-recheck it and make sure the engine is in normal operating temperature and idling while you check the level-Filter could be clogging-who knows-if it continues bring it in to a transmission specialty shop and have it pressure tested this will give you the direction where to start the diagnosis-possibilities the detent cable out of adjustment,governor,sticking solenoid and a clogged valve body etc-
Nov 18, 2012 at 1:07 PM
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