Firebird V6-173 2.8L VIN L 2-bbl HP (1983)
Idle Speed: Customer Interest
A/T - 3rd-2nd, 2nd-1st Gear Coastdown Clunk
Number 84-7-17
Date 4/84
Subject:
3-2 2-1 COASTDOWN CLUNK - THM 200-C 1983 CN, CS AND HO MODELS, 1984 ALL MODELS
Some 1983 and 1984 THM 200-C model transmissions may experience a 3-2 and/or 2-1 coastdown clunk condition. This condition is most noticeable
during the 3-2 downshift at approximately 18-20 miles per hour.
When servicing any 1983 or 1984 THM 200-C model transmission for 3-2 and/or 2-1 coastdown clunk refer to the service procedure below.
Service Procedure:
1.
Check engine idle speed. This coastdown clunk is especially noticeable when the engine is cold.
2.
Check rear differential back lash and correct if necessary.
3.
If this coastdown clunk condition still exists, after checking the above stated service procedure on 1983 CN, CS, and HO models equipped with
2.8 litre V-6 engines, replace the valve body spacer plate with Part Number 8648303. On car service can be performed in changing the valve body
spacer plate, refer to your service manual for proper installation procedure.
