M/T/Axle - Improved Performance and Launch
Number: 83-I-75Section: IV & VI
Date: May, 1983
Subject: IMPROVED PERFORMANCE AND LAUNCH 1983 "S/T" 10 PICKUPS AND BLAZERS WITH RPO LR2 AND RPO YF5 (2.8L V6 ENGINE AND CALIFORNIA EMISSIONS)
TO: ALL CHEVROLET DEALERS
To improve performance and launch on the subject trucks, the following combinations of transmission and axle ratio are now certified and may be substituted under warranty as a field fix upon customer complaint.
S-10 pickups with manual four and five speed transmission - maximum ratio is 3.42 regardless of tire size.
T-10 pickups with manual four and five speed transmission - maximum ratio is 3.73 with P235/75 R15 tires.
T-10 blazers with RPO MXO automatic with overdrive - maximum ratio is 4.11 with P235/75 R15 tires.
For field fix only - the S-10 pickups with manual four and five speed transmission - maximum ratio is 3.73 regardless of tire size.