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TSB 21-05-95A

Delayed Transmission Engagement/Torque Converter Drainback

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Date:  Jan 5, 1996

Models: 1994-1995 with V10 or Diesel engines and automatic transmission


Delayed transmission engagement of 2 to 8 seconds after startup due to torque converter drainback. The condition is most common after the vehicle has been parked for an extended period.


Using Mopar Diagnostic System ot the Scan Tool (DRB II or III) with the Diagnostic Procedure Manual, verify that all engine systems are functioning as designed. Record all DTC's for repair. If no codes are present and all systems are functioning normally, check the transmission fluid level. If the fluid level is correct, perform the repair procedure.



Diesel Repair:    install transmission lines with a one-way  anti-drainback valve
  1. Locate the transmission oil cooler pressure line (Fig 1 shows a typical cooler hose arrangement)
  2. Disconnect the pressure line at both ends and discard the old line. On the diesel, this line goes from the transmission to the engine compartment cooler. On the V10, this line runs from the transmission to the auxiliary cooler.
  3. Remove the pressure and return line quick connectors from the transmission and discard.
  4. Install new 1/2" 1/4x18 connectors into the transmission case.
  5. Insert new pressure tube and hose assembly with drainback valve into the quick connector. Push line inward until lock tabs secure the line. A snap should be heard as the tabs seat behind the cooler line flange. Reinstall the return line in the same manner.
  6. DIESEL ONLY: Disconnect the inlet and outlet lines at the transmission oil to water cooler. Discard the pressure line. Remove the connectors from the cooler and discard.
  7. DIESEL ONLY: Install the 1/2" 3/8X18 THD quick connects into the cooler.
  8. DIESEL ONLY: Push new pressure tube line inward until lock tabs secure the line. A snap should be heard as the tabs seat behind the cooler line flange.
  9. Pull outward on cooler lines at all points to verify they are secured.
  10. Start the engine and check for any leaks.

Thanks to Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004