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Author Topic: TH350c lockup converter slipping in and out  (Read 3829 times)

Offline sleepchamber

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TH350c lockup converter slipping in and out
« on: December 05, 2011, 04:35:00 pm »
Anyone ever had the lockup converter slip in and out?  Engages at 45mph and seems to stay engaged as long as I stay at 45mph....anything over and back down to 45mph the converter slips in and out of engagement constantly.  This is an '85 C10, 305ci, non-computer controlled carb and distributor.
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1985 Scottsdale C-10

Offline VileZambonie

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Re: TH350c lockup converter slipping in and out
« Reply #1 on: December 05, 2011, 10:17:14 pm »
Fluid level and condition is good? Low vacuum switch is connected and detent cable properly adjusted? TCC Brake switch is OK?
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Offline sleepchamber

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Re: TH350c lockup converter slipping in and out
« Reply #2 on: December 13, 2011, 11:51:21 am »
Fluid is clean and full...the vacuum switch is connected...detent is not connected.  What is the TCC brake switch?
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1985 Scottsdale C-10

Offline bd

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Re: TH350c lockup converter slipping in and out
« Reply #3 on: December 13, 2011, 01:24:50 pm »
Check the switch adjustment (common cause of the symptom you're describing).  The switch is depressed by a metal bracket bolted to the brake pedal arm, behind the dash.  If not adjusted correctly, minor movement of the brake pedal while driving will cause frustrating converter disengagement.
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Offline sleepchamber

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Re: TH350c lockup converter slipping in and out
« Reply #4 on: December 13, 2011, 01:31:19 pm »
Will check this when the weekend comes....thanks for the suggestions.
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1985 Scottsdale C-10

Offline sleepchamber

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Re: TH350c lockup converter slipping in and out
« Reply #5 on: December 19, 2011, 09:50:05 am »
It was....a dry-rotted vacuum line to the switch behind the brake booster.  Went ahead and replaced all of the vacuum lines.  Thanks dudes.
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1985 Scottsdale C-10
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