A/T - Soft 1st-2nd and 2nd-3rd Gear Shifts
Number 84-7-16 Date 4/84Subject: SOFT 1-2 AND 2-3 SHIFTS ALL THM 200-C AND 200-4R
Some THM 200-C and 200-4R transmissions may exhibit a soft 1-2 and 2-3 shift. This condition may be caused by a leak in the intermediate servo piston seal area.
Beginning January 1984, all THM 200-C and 200-4R transmissions are being produced using a new intermediate servo piston that uses rubber lip seals in place of scarf cut Teflon seal rings.
When servicing any THM 200-C or 200-4R transmissions, for a soft 1-2 and 2-3 shift, replace the intermediate servo piston scarf cut seals with the new rubber lip seals. Refer to your parts listing for appropriate intermediate servo piston service package. The new intermediate servo piston lip seals are serviced separately, but must not be installed onto the past intermediate servo piston.
Figure 1 - Past Seals:
Figure 2 - New Seals:
The scarf cut Teflon seal rings will continue to be serviced for past intermediate servo pistons.. Refer to Figures 1 and 2 to identify the past seals from the new seals and for correct orientation of the new rubber lip seal on the intermediate servo piston.