Fleetwood FWD V8-252 4.1L (1986)
Valve Body: All Technical Service Bulletins
A/T - THM 440 Harsh Shift 3rd to 2nd Gear
Bulletin No. T
88-32
File in Group
7
Number
174
Corp. Ref. No.
777140R
Date
Oct. '87
SUBJECT:
HARSH 3-2 SHIFT - THM 440-T4
MODELS AFFECTED: 1985-1987 DE VILLES AND FLEETWOODS 1986 ELDORADOS AND SEVILLES
This bulletin supplements information previously published in Serviceman Bulletins T-87-43, T-87-44 and T-87-52.
Some 1985-1987 De Villes and Fleetwoods, and 1986 Eldorados and Sevilles equipped with THM 440-T4 transaxles may exhibit very harsh, or
intermittent harsh 3-2 down shifts. Very harsh 3-2 part throttle down shifts between 20-40 mph may be caused by a missing or mislocated #2 (3-2
control) checkball. An intermittent harsh 3-2 down shifts during a part throttle detent down shift may be caused by a broken 3-2 line control retainer.
FIGURE 1 - CHECK BALL LOCATIONS - CHANNEL PLATE
VERY HARSH, PART THROTTLE 3-2 DOWN SHIFTS BETWEEN 20-40 MPH
To repair this condition, remove the valve body and inspect for the checkball. A mislocated checkball may have bent the spacer plate, in which case the
spacer plate must be replaced (see Figure 1).
