S10/T10 P/U 2WD V6-262 4.3L (1988)
Exhaust Pipe/Muffler Hanger: All Technical Service Bulletins
Engine - Vibration On Acceleration
Number:
88-270-6F
Section:
6F
Date:
JULY, 1988
Subject VIBRATION ON ACCELERATION
Model and Year 1988 S/T TRUCK W/4.3L (VIN CODE Z) ENGINE
TO:
ALL CHEVROLET DEALERS
Some 1988 S/T Trucks equipped with 4.3L engines may experience a vibration that can be felt in the floor pan area near the shifter, in the right hand
passenger seat foot area, or on the steering column. These conditions may be caused by the following items:
1.
The shifter rod that goes from the steering column to the transmission equalizer lever (#340 and #338 in Figure 36 page 7A-45 of the 1988 S/T
Manual) hitting the exhaust crossover pipe and/or the equalizer lever making firm contact at the shift lever (T-truck only).
2.
The exhaust pipe to catalytic converter clamp (Figure 7, page 6F-6 of the 1988 S/T Manual) hitting the catalytic converter heat shield.
3.
The exhaust pipe to converter installation allows the exhaust pipe to contact the transmission crossmember.
To repair these conditions, use the following procedures:
1.
A. Raise vehicle on hoist.
B.
Check Transmission linkage for correct adjustment.
C.
Check exhaust pipe for shifter rod interference (shiny spot on pipe).
D.
If linkage hits pipe, remove 15 mm (5/8 in) from bottom of rod.
E.
Put transmission into low gear and mark exhaust pipe area near linkage.
F.
Put transmission in park. Using a hammer, lightly dimple exhaust pipe for additional clearance.
