Coolant in transmission fluid from failed radiator

1995 CHEVROLET TAHOE
50,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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JEFFERY JAMES
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  • 2 POSTS
Radiator failed allowing engine coolant to enter transmission. I have replaced radiator and flushed the transmission twice and I am still getting some slippage. Help!
Oct 15, 2017 at 11:14 AM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
Once coolant gets into the transmission oil you just cannot flush it out, it will affect seals and clutch linings. i feel that the only real solution is transmission out and total strip and re-build. the slipping if allowed to continue will just get worse and cause more damage.
Oct 15, 2017 at 2:26 PM
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JEFFERY JAMES
  • MEMBER
  • 2 POSTS
Thank you for the quick reply MHPAUTOS. At cold start up, the transmission works great for about five minutes. Is it building up excessive pressure and causing the slippage? Why would it not slip right from the start?
Oct 15, 2017 at 8:35 PM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
Cold plate grips better as the system heats up friction loss due to the contamination on the plates and discs start to take effect, it is a bit of a snow ball down hill thing.
Oct 15, 2017 at 9:25 PM
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