Full Size Chevrolet V8-350 5.7L DSL (1984)
Valve Body: Customer Interest
A/T - Occasional Long 1st-2nd Gear Shift When Cold
85-29
7A (VIIc)
Feb., 1985
Subject:
OCCASIONAL LONG 1-2 SHIFT WHEN COLD
Model and Year: SOME 1984 AND EARLY 1985 THM 200C
TO:
ALL CHEVROLET DEALERS
Some 1984 thru early 1985 THM 200C transmissions may experience an occasional long 1-2 shift when cold. To repair this condition,
a new spacer plate went into production on September 24, 1984 (Julian Date 268).
FIGURE 1 TYPICAL 200C SPACER PLATE
When servicing any 1984 thru early 1985 THM 200C transmission built before the above Julian Date, remove the valve body spacer
plate. Drill the 2nd and 3rd clutch exhaust orifice out to 3.57 mm (9/64") (refer to Figure 1 below). Using a 6.3 mm (1/4") drill bit,
hand chamfer both sides of the hole, slightly, to remove burrs and rough edges.
