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Unecessary shifting while driving

Tiny
HOTRODDER69
  • MEMBER
  • 1991 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
My 1991 Chevy S10 4x4 has a 4.3 v6 and 700R4. Anytime it is rainy/dewey/cool outside, it downshifts repeatedly, but then goes right back up in a heartbeat. Almost like a hiccup, but I know it's not a misfire. So the transmission is unecessarily shifting while cruising. I changed the tranny fluid and filter but it still does it. Any ideas? Any help would be greatly appreciated
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Tuesday, March 22nd, 2011 AT 10:50 PM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Is the check engine light coming on at all?
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Tuesday, March 22nd, 2011 AT 11:56 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Best thing here is to take it to a trans guy and have him diagnose this. You may have an electrical problem at the trans that causes this.
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Thursday, March 24th, 2011 AT 10:16 PM

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