Electra Park Avenue V8-307 5.0L VIN Y 4-bbl (1984)
Band Apply Servo: All Technical Service Bulletins
A/T - Soft 1-2 and 2-3 Shifts
Bulletin 84-7-4
Date April '84
Ref. No. 84-203-7
SUBJECT:
SOFT 1-2 and 2-3 SHIFTS
MODELS AFFECTED:
ALL THM 200-C, 200-4R & 325-4L TRANSMISSIONS
Some THM 200-C, 200-4R, and 325-4L 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, 200-4R and 325-4L 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, 200-4R, or 325-4L transmissions, for a soft 1-2 and 2-3 shift, replace the intermediate servo piston scarf cut seals with
the new rubber lip seals which are included in the intermediate servo piston service package. Refer to your parts listing for appropriate 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 - NEW RUBBER LIP SEALS
FIGURE 2 - PAST SCARF CUT TEFLONSEAL RINGS
The scarf cut Teflon 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.
