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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: sleepchamber on December 05, 2011, 04:35:00 pm

Title: TH350c lockup converter slipping in and out
Post by: sleepchamber 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.

Title: Re: TH350c lockup converter slipping in and out
Post by: VileZambonie 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?

Title: Re: TH350c lockup converter slipping in and out
Post by: sleepchamber 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?

Title: Re: TH350c lockup converter slipping in and out
Post by: bd 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.

Title: Re: TH350c lockup converter slipping in and out
Post by: sleepchamber on December 13, 2011, 01:31:19 pm

Will check this when the weekend comes....thanks for the suggestions.

Title: Re: TH350c lockup converter slipping in and out
Post by: sleepchamber 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.