Caprice V6-262 4.3L (1987)
Valve Body: All Technical Service Bulletins
A/T - Harsh Park/Neutral to Reverse Engagement
Number:
88-421-7A
Section:
7A
Date:
August 1989
Subject:
HARSH PARK OR NEUTRAL TO REVERSE ENGAGEMENT
Model and Year:
1987-88 B CAR WITH THM 200-4R TRANSMISSION
TO:
ALL CHEVROLET DEALERS
This bulletin covers service parts for a 1987 or 1988 THM 200-4R transmission exhibiting a harsh Park or Neutral to Reverse engagement. The "reverse
engagement package," a new spacer plate and 1-2 accumulator housing assembly are available for service. The spacer plate and accumulator housing
function as a Reverse accumulator to soften Reverse engagement.
Figure 1 - THM 200-4R Transmission Identification Information
DATE OF PRODUCTION CHANGE: (Figure 1)
All THM 200-4R models built after March 14, 1988 (Julian date 074), were built with the new Spacer Plate and 1-2 Accumulator Housing Assembly.