NUMBER: 67-43
DATE: 3-31-67
GROUP: Automatic Transmission
SUBGROUP: Adjustment

MODELS: All Models Equipped With Borg-Warner 35 Transmission
SUBJECT: Thumping Noise

Some cases of a thumping noise from the transmission have been reported when shifting into ‘D’ or ‘D1′. If you should encounter this, the following action is recommended:

1. Be sure that engine idling speed is correct and that the throttle is not sticking.
2. Check and adjust if necessary, downshift cable using a pressure gauge and tachometer. See WSM 139, Part 1, pages 8, 9 and 10.
3. Remove transmission pan and valve block. Be sure that the following valves are free to operate and are not sticking:
   1. throttle valve
   2. primary regulator valve
   3. modulator valve
4. Fit replacement 1st/2nd shift valve spring, part number 5039919.
5. Re-fit valve block and pan. Re-fill with oil and road test as per WSM 139, Part 3, page 4.

T.H. Bullard
Manager – Service & Parts

Related posts:

1. Bulletin 67-9: Borg-Warner 35 Adjustment
2. Bulletin 67-6: Borg-Warner 35 Front Pump Oil Leak
3. Bulletin 67-44: Alpine V, Minx VI & Arrow New Oil Pressure Relief
4. Bulletin 66-6: 1725cc Oil Pressure Relief Valve Change
5. Bulletin 66-2: Tiger 260 Carburettor Modification