Caprice V8-307 5.0L (1987)
Valve Body: Customer Interest
A/T - No 2nd to 1st Gear Coastdown Shift When Cold
Number:
88-164-7A
Section:
7A
Date:
MARCH, 1988
Subject:
NO 2-1 COASTDOWN SHIFT WHEN COLD/
AMBIENT TEMPERATURE FREEZING OR BELOW
Model and Year:
1987-88 CAPRICE CLASSIC, MONTE CARLO, EL CAMINO WITH THM 200-4R TRANSMISSIONS
TO:
ALL CHEVROLET DEALERS
Some of the subject vehicles with a THM 200-4R transmission may exhibit the following condition:
FIGURE 1 - CONTROL VALVE ASSEMBLY
No 2-1 coastdown shift after being started up cold in cold weather (freezing or below) and driven a short distance and stopped. The car may start out in
2nd gear after the first stop, and then exhibit normal coastdown shifts thereafter. This condition will occur with the selector in D3 or D4 only and may be
eliminated by installing a new 1-2 throttle valve spring (Figure 1, Item 335) in the valve body.
FIGURE 2 - THM 200-4R TRANSMISSION IDENTIFICATION INFORMATION
January 12, 1988 (Julian Date 012, Figure 2) the 1-2 throttle valve spring change entered production to eliminate 2nd gear starts. To repair this
condition, remove the valve body (on-car service procedure--the 1-2 accumulator housing will hold the spacer plate and check balls in place). Place the
valve body on a clean workbench and change the 1-2 shift valve spring. Do not attempt to change the spring as an on-car service procedure.
SERVICE PARTS INFORMATION:
Part No.
Description
Years
Models
